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BMW Oxygen Sensor Replacement
 
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Pelican Technical Article:

BMW Oxygen Sensor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Tools:

Oxygen sensor socket, 22mm wrench, flathead screwdriver

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-13)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 328xi Coupe (2007-13)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is Coupe/Conv (2007-13)
BMW 335xi Coupe (2007-13)

Parts Required:

Oxygen sensors, anti-seize paste

Hot Tip:

Work with a cool exhaust

Performance Gain:

Remedy fault codes and maintain proper running engine

Complementary Modification:

Replace in pairs

Oxygen sensors should be replaced every 100,000 miles. In a perfect world that would be it, wait until a specified mileage and replace the sensor. However, these sensors fail prematurely, set oxygen sensor fault codes and reduce fuel economy. In this article, I will show you how to identify the location of all 4 oxygen sensors and how to replace them. You will need an oxygen sensor socket to remove the sensors and remember to always work with a cool exhaust. Oxygen sensors are fragile, do not drop, damage may occur. Also, keep sensor tip clean when reinstalling.

Oxygen sensors are laid out in banks which refer to cylinders and in sensor numbers referring to before or after the catalytic converter. Bank1 or B1 refers to cylinders 1-3. Bank 2 or B2 refers to cylinders 4-6. Sensor 1 or S1 refers to sensor before catalytic converter. Sensor 2 or S2 refers to sensor after catalytic converter.

Bank 1 Sensor 1, green arrow.
Figure 1

Bank 1 Sensor 1, green arrow. Bank 2 Sensor 1, yellow arrow Bank 2 sensor is hard to see in this photo, yellow arrow points to where it is. It is buried beneath the ignition wiring harness.

Bank 1 Sensor 2, green arrow.
Figure 2

Bank 1 Sensor 2, green arrow. Bank 2 Sensor 2, yellow arrow Replacing sensors before catalytic converter Remove engine covers. See our tech article on engine covers removing. Oxygen sensors are located in exhaust manifold.

Locate oxygen sensor electrical connectors at right side of engine above exhaust manifold.
Figure 3

Locate oxygen sensor electrical connectors at right side of engine above exhaust manifold. (green arrows). Label or mark connectors to aide during reinstallation. I suggest replacing one sensor at a time so you do not mix up connectors.

Next, disconnect electrical connector of oxygen sensor you are replacing.
Figure 4

Next, disconnect electrical connector of oxygen sensor you are replacing. (green arrow) First, remove the electrical connector from the mounting bracket by pulling straight up. Once out, disconnect electrical connector by pressing release tab and pulling apart.

Using an oxygen sensor socket, remove oxygen sensor from exhaust manifold.
Figure 5

Using an oxygen sensor socket, remove oxygen sensor from exhaust manifold. Lightly coat new oxygen sensor thread with anti-seize compound. Install new oxygen sensor and tighten to 50Nm (37 ft-lb). Then reroute wiring harness and connect electrical connector. Repeat if replacing both sensors. Then reassemble engine covers and clear any engine fault codes using a BMW scan tool. Replacing sensors after catalytic converter Oxygen sensors are located in exhaust, behind catalytic converters. Working below transmission, remove transmission splash shield. See our tech article on lower splash shield replacing.

Locate oxygen sensor electrical connectors, they are mounted to a bracket at the bottom of transmission bell housing.
Figure 6

Locate oxygen sensor electrical connectors, they are mounted to a bracket at the bottom of transmission bell housing. (green arrows). Label or mark connectors to aide during reinstallation. I suggest replacing one sensor at a time so you do not mix up connectors.

Next, disconnect electrical connector of oxygen sensor you are replacing.
Figure 7

Next, disconnect electrical connector of oxygen sensor you are replacing. Then detach wiring harness from mounting clips by pulling out.

Using an oxygen sensor socket, remove oxygen sensor from exhaust pipe.
Figure 8

Using an oxygen sensor socket, remove oxygen sensor from exhaust pipe. The post-catalyst oxygen sensors have an insulating foil shield. To get the oxygen sensor socket onto the hex of the socket you have to compress the foil a small amount, just enough to squeeze the socket over it. Lightly coat new oxygen sensor thread with anti-seize compound. Install new oxygen sensor and tighten to 50Nm (37 ft-lb). Then reroute wiring harness and connect electrical connector. Repeat if replacing both sensors. Then reassemble engine covers and clear any engine fault codes using a BMW scan tool.

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Comments and Suggestions:
335e92tx Comments: PS, there are no codes of any type except for Thermostat heater.
December 5, 2016
335e92tx Comments: The car is a 2007 e92.
mileage 125K

The problem started after an oil change at the local service non dealer. Original symptoms were erratic idle cold start or at operating temp. No vacuum leaks identified.
TMAP sensor replaced as were Vanos solenoids - no difference.

Local dealer could find no problems. Eventually taken to an indy service and they 'reset' what had been done by 'me/owner'. Prior to taking it anywhere all adaptions had been reset by BTech cable and also INPA/MHD. It had no effect.

After service at indy who didnt bother to drive it, surge still being experienced in 1200-1800 rpm 10-14 percent accelerator and 8" of vacuum light load conditions when at operating temp. No surge prior to warmup.

Current presumption is front O2 sensors have become fouled or contaminated. And other suggestions?
December 5, 2016
srvaldes Comments: Hi guys.
I have a faul 2af0 on bmw e90 320i from 2008.
I do do not know wich sensor I have to order. Could anyone please advise?
Thank you
November 30, 2016
  Followup from the Pelican Staff: That fault code is for the NoX sensor in the exhaust. - Nick at Pelican Parts  
David_bdd Comments: Hey Guys, help would be much appreciated. Whats the problem and Which parts do I need?
Car- E93 335i 2009
Codes-
2C31 O2 Sensor Before Catalyst, Trim Control
2C2B O2 Sensor Before Catalyst, System Check
2C6B O2 Sensor After Catalyst, System Check
November 27, 2016
  Followup from the Pelican Staff: Sounds like an o2 sensor or fuel trim fault. I would check for exhaust and intake air leaks. If sealed, replace the pre and post cat oxygen sensors. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
sdw Comments: Hi, I'd be grateful for your advice. I have a 2007 E92 320i with codes showing P0597, P114C, P126E and P2273 O2 Sensor stuck rich Bank 2 Sensor 2.

No. 4 plug was pretty coked, these have been replaced now, and I have a bit of soot on the exhaust. Same fault codes - is it time to replace the O2 sensor and should both be done at the same time?

Thanks
November 18, 2016
  Followup from the Pelican Staff: Try forcing the sensor lean, if it won't go, replace it. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Thomas Comments: Some more details on the errors of my previous post:
- Fault: DeNOx catalyst sulfuric
- Code: 0030EA
- Fault: Nitrogen oxide sensor electrically
- Code: 002AF4
- Fault: Nitrogen oxide sensor lambda
- Code: 002AF2
- Fault: Nitrogen oxide sensor power supply
- Code: 002AF6
- Fault: Nitrogen oxide sensor Nox signal
- Code: 002AF9
- Fault: AfterCat 02 sensor trim control, bank 2
- Code: 002C7F
November 6, 2016
  Followup from the Pelican Staff: I would start with the post cat oxygen sensor for these faults.- Nick at Pelican Parts  
Thomas Comments: Hi,

I bought a used E90 320i N43 engine with very low mileage 15000 km which was sitting in a garage for years and the battery is below 12V ~11.3 V measured via OBD when the car is not started. A OBD quick scan I did showed the following errors:
30EA,2AF4,2AF2,2AF6, 30DA, 2AF9 Engine coolant temperature ECT sensor.
Although I reset them, most of them came back soon.

Today I also got a check engine light with the error: P122F.

Do you think I need to order coils, or oxygen sensonr? I am a bit confused.

Thanks
November 6, 2016
  Followup from the Pelican Staff: I don't have that fault code description, for US models with a 6-cylinder, a similar fault would be for pedal position sensor. Could be due to low battery voltage. - Nick at Pelican Parts  
John Comments: Hi, I'm getting 4 different oxygen sensor related faults on a 2011 E92 320i.

P112C - seems to be O2 sensor pre-cat, line fault. Possibly bank 1, sensor 1? Hard to find info on this one to be sure.

P114C - pretty certain this is a post-cat fuel trim too rich, on bank 2, and post-cat is sensor 2?

P2196 - O2 sensor signal stuck rich, bank 1 sensor 1

P2272 - O2 sensor signal stuck rich, bank 2, sensor 2.

So I've got a rich signal pre-cat on the first bank, and a rich signal post-cat on the second bank. The codes seem to be in pairs. Is this just coincidence that I've got 2 sensors going, or have I more likely got 1 broken sensor and the false reports from that are throwing the others off? I'm trying to think it through logically in my head but can't decide which sensor to be suspicious of!

Any help appreciated!

Regards.
November 1, 2016
  Followup from the Pelican Staff: P122C is a circuit code for the sensor pump. bank 1 sensor 1. Likely a faulty sensor.

P114c is post catalyst fuel trim too rich bank 2.

I'd start with b1s1. Also double check the sensors are plugged into the right connectors. - Nick at Pelican Parts
 
LimuBMW Comments: I drive a 2011 328I and recently my SES light came on, it's throwing the code P2098. When checked it read O2 sensor post cat bank 2 too lean. Do I need to change the o2 sensor or could this be caused by something else?
October 24, 2016
  Followup from the Pelican Staff: It could be a faulty sensor. Confirm the exhaust is sealed and there are no unmetered air leaks, then if all is well, replace the sensor. - Nick at Pelican Parts  
YASHIN0227 Comments: Hi i received an error today. P1061 THE YELLOW ENGINE LIGHT CAME ON. Cud this error be due to a faulty oxygen sensor
October 13, 2016
  Followup from the Pelican Staff: I believe that faulty is for an engine timing issue. - Nick at Pelican Parts  
Mohd Comments: Hi,
I keep receiving the following errors in my car E92 335i 2009 model:

29E1 Fuel mixture control 2
2C31 Lambda probe in front of catalytic converter, trimming control
2C2B Lambda probe in front of catalytic converter, system check

I have replaced the HPFP due to rough idle and engine failure but the above codes still appeare every time I start the car.

Is it the O2 sensors needs to be replaced, what do advice me to do

Thanks in advance
Regards
Mohd
October 12, 2016
  Followup from the Pelican Staff: The codes are for the oxygen sensors, if there are no air leaks or exhaust leaks, the sensors are likely faulty. - Nick at Pelican Parts  
YASHIN0227 Comments: Hi i received an error P0041. Got this after the exhaust guys removed catalytic convertor. I did show them this but they say its not their issue.
How do i resolve the issue?
Bmw E90 320i m_sport 2007
October 8, 2016
  Followup from the Pelican Staff: It's an oxygen sensor fault. So most likely related to the work performed. Usually this fault sets when the o2 sensors are plugged into the wrong harness. - Nick at Pelican Parts  
Desmond Comments: Had these 2 codes a while ago.
Lambda probe front catalyst, adjustment control
Code: 002C31

02 PreCat sensor system check, bank 1
Code: 002C2B

Switched out the O2 sensor in Bank 1 before Cat, 002C31 is still showing after I switched out the part and cleared the code.

Here's a freeze frame.


Faultcode: Lambda probe front catalyst, adjustment control
Faultset 1:
appeared at: 143128.0km
Input Rueckfuehrregler 1:
0.06 V
Lambda shift Rueckfuehrregler 1:
0.00 -
Voltage Lambda probe after catalytic converter Bank 1:
0.61 V
Voltage Lambda probe before catalytic converter Bank 1:
1.70 V

Any ideas?
September 29, 2016
  Followup from the Pelican Staff: The fault is for control, which could be fuel trim or a bias sensor. You will have to check if the fuel trim is skewed to start. - Nick at Pelican Parts  
Tony Comments: Got a P2098 ODBII Code or 2C32 present/not present on my LCI 2011 328i. I already changed the bank 2 pre CAT sensor. After clearing all the adaptations and clearing the fault code, the error returned after a week or so. Changed the fuel cap. Cleaned the MAF and still no permanent fix. Should I change the post CAT sensor on bank 2? Should I change the MAF? Both? Any help before I breakdown and go to a mechanic is greatly appreciated.
September 19, 2016
  Followup from the Pelican Staff: That fault is usually a leak in the exhaust system, a faulty rear sensor or faulty catalytic converter. - Nick at Pelican Parts  
RNB3 Comments: Hi there,
I have a 2006 330i. Yesterday the SES light popped up and I had the code pulled which is P0030 indicating bank 1, sensor 1. Is this the O2 sensor that I should be replacing?
Thank you very much!
September 6, 2016
  Followup from the Pelican Staff: Yes. The o2 sensor closest to cylinder #1. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
hfj00 Comments: Hello,

I keep getting the following errors:

Oxygen sensor, plausibility before cat., bank 1
Oxygen sensor, plausibility before cat., bank 2

Appreciate your support. Thanks.
September 5, 2016
  Followup from the Pelican Staff: What vehicle model and year? What are the P-codes? - Nick at Pelican Parts  
Desmond Comments: The car drives fine, lacking a bit of power lately I guess, thought it was just another coil that's on its way out. However, service light went on today, pulled the codes today and it wasn't.

Lambda probe front catalyst, adjustment control
Code: 002C31

02 PreCat sensor system check, bank 1
Code: 002C2B

It's a 09 328i N52.
September 3, 2016
  Followup from the Pelican Staff: The issue may be a faulty o2 sensor, closest to cylinder 1. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Brian Comments: I have a 2007 BMW 335I and I am getting the following error codes. P1146, P2270, P0139 and P0138. Do I need to replace my O2 sensor and fi so which ones.
August 19, 2016
  Followup from the Pelican Staff: Looks like it may be bank 1 sensor 2. However, the descriptions to the fault codes would help. - Nick at Pelican Parts  
jjbobs Comments: Hi there,
Sorry its a 2009 e92 335i n54
August 18, 2016
  Followup from the Pelican Staff: The faults indicate a mixture problem on bank 1 of your engine. Look at the sensor for cyls 1 - 3. - Nick at Pelican Parts  
jjbobs Comments: HI there,

i have code 2A2B , 29E0, 2C27
Is this oxygen sensor from bank 1 ?what part do i need to purchase..?
seems im running lean. black smoke , stutter idle
thank you
August 16, 2016
  Followup from the Pelican Staff: You didn't mention what vehicle you have so I can;t be sure what the codes mean. Unless you have generic P-codes, those are usually similar regardless of vehicle model. - Nick at Pelican Parts  
Anton Comments: Oh, I see. For some reason numbers are same for idle, 2500 rpm no load, and cruising. They change only when car is accelerating esp if I push accelerator hard.
Multiplicative mixture adaptation - 52.14%
Multiplicative mixture adaptation 2 - 71.59%
Thanks a lot, Nick!
August 16, 2016
  Followup from the Pelican Staff: Looks like you have a lean condition. Most likely fuel delivery or mass air flow. Since the vehicle is lean at idle and when driving, check for major vacuum leaks first. - Nick at Pelican Parts  
Anton Comments: Idle:
Signal, Oxygen Sensor after catalytic converter - 0.67V
Signal, Oxygen Sensor 2 after catalytic converter - 0.69V
Additional mixture adaptation - 1.19
Additional mixture adaptation 2 - 1.19

2500 RPM no load:
Signal, Oxygen Sensor after catalytic converter - 0.74V
Signal, Oxygen Sensor 2 after catalytic converter - 0.74V
Additional mixture adaptation - 0.36
Additional mixture adaptation 2 - 0.36

Cruising at 70 MPH:
Signal, Oxygen Sensor after catalytic converter - 0.76V
Signal, Oxygen Sensor 2 after catalytic converter - 0.74V
Additional mixture adaptation - 0.36
Additional mixture adaptation 2 - 0.36
August 14, 2016
  Followup from the Pelican Staff: I need the multiplicative numbers as well. Additive is the adjustment at low range only. - Nick at Pelican Parts  
Anton Comments: Got SES light with error code 29E1 "Fuel Fuel Mixture Control 2". I have RPM drop after cold start and rough idle. Also my gas mileage got worse.

Today I noticed voltage drop on oxygen sensor 2. Doesn't happen all the time, but DME reads:
Signal, Oxygen Sensor after catalytic converter 0.70V
Signal, Oxygen Sensor 2 after catalytic converter 0.16V

Should I replace O2 sensor? If so, which harness length do I need - 490 or 560? Many thanks in advance!

PS: last digits of my VIN are P118734
August 11, 2016
  Followup from the Pelican Staff: The fuel trim numbers will help, not o2 sensor voltage. What is fuel trim doing at idle, 2500 rpm no load and at a steady cruise? - Nick at Pelican Parts  
CB Comments: I have a 2009 E90 BMW 320i. Needs a precatalytic converter oxygen sensor. Not seeing it on your site
July 29, 2016
  Followup from the Pelican Staff: May not be listed to the model not being from the US in 2009. To be sure, Give our parts specialists a call at 1-310-626-8765
- Nick at Pelican Parts
 
JD Comments: Hi Nick,
I have a BMW 320i 2.0L Petrol, with N46T Engine E90 chassis, 2008 model, as I am aware that this model was not introduced in the states, but I have a question and I tried to search the whole internet but couldn't find a single thing on it,
Recently I scanned my BMW OBD Computer with an Autel OBD Kit, and I got a fault code regarding an oxygen sensor, now the problem is no one in the local market is competent enough to understand the fault, sorry to mention that I am living in Qatar Middle East, so please check the below fault code and advice that what the proper solution to resolve the issue, and secondly I can smell rich fuel from exhaust during idle time, and some times white smoke for few seconds;

DME: Oxygen Sensor heating after catalytic converter, activation
Fault Code - 2A53

Regards
Jd
July 26, 2016
  Followup from the Pelican Staff: That code is for the sensor heater, post cat sensor. If the sensor has power and a control activation from the DME, the sensor is likely faulty. - Nick at Pelican Parts  
Daniel Comments: Hi Nick,
I have a 2008 335i coupe. A few days of rough starts made me check codes. At first, my only code was P0175 system too rich, which I believe is on bank 2, correct? After an additional week of throwing that code, a new/additional code came up...P0030 for the HO2S. That code suggests a pre-cat bank 1 O2 sensor fail, correct?

What are the chances that both codes were thrown as a result of the failed O2 sensor sensor 1, bank 1?

And if not, what would be your thought on the fact that P0175 bank 2 and yet the bank 1 P0030 code are throwing at the same time?

Thanks!
July 14, 2016
  Followup from the Pelican Staff: That is for bank 2.

Usually the o2 code would set before the fuel trim fault. If the o2 code came up after clearing the fuel trim fault, confirm the o2 is stuck rich by trying to force it lean by creating a large vacuum leak. If it doesn't respond, it is likely faulty.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Paulsat Comments: Hi,
I have 2011 328i BMW and the OBD is showing these two codes P2098 and P2198. I changed the catalytic converter of bank 2, but still showing same codes, is it possible the pre-cat O2 sensor need to be replaced?

I'm thinking to switch the pre O2 sensors to see whether the code will go for bank 1. Are the two pre sensors the same?
Thank you for your help
July 11, 2016
  Followup from the Pelican Staff: These are fuel trim faults, not necessarily catalyst efficiency faults. Items that could cause these faults: bias o2 sensors, air leak in exhaust, catalyst oxygen storage, fuel control issue. - Nick at Pelican Parts  
Adamant Comments: Hi I have a BMW e90 318 I have replaced the pre cat o2 sensor as I was getting the heater failure codes I have reset the small engine light but it has come back on with the same issue though I have replaced the sensor do I I need to change the post cat o2 sensor also ? Or is there something else I need to look into as this is driving me mad regards Darren
July 10, 2016
  Followup from the Pelican Staff: What fault code is stored? If a code for the same sensor keep coming up, check the wiring from the DME to the sensor. - Nick at Pelican Parts  
Tom Comments: Hi, are these the NOx sensors? or they different?
June 23, 2016
  Followup from the Pelican Staff: Nox sensors are different. - Nick at Pelican Parts  
Andre Comments: HI All. Have a question. I have a 2009 335i Xdrive. do these instructions apply to XDrive as well? i actually can't see my O2 sensors from the top. i haven't gone all the way in so i'm sure i have to remove some stuff to see them but are the instructions pretty much the same? Or is there something different i'll need to do on this engine? Thanks in advance!
June 14, 2016
  Followup from the Pelican Staff: No, this is for the normally-aspirated models. Your sensors are similar to this model http://www.pelicanparts.com/techarticles/BMW-E60/84-EXHAUST-Oxygen_Sensor_N54_Engine_Replacement/84-EXHAUST-Oxygen_Sensor_N54_Engine_Replacement.htm

For precise instructions, I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Ed Comments: I have a 2007 BMW 328i and the service engine light came on. I attached my reader to it and received the following codes:

P114D - Not sure what this is??
2C7F - DME: Lambda Control 2

I did O2 Sensor Monitoring while driving and at idle to see the voltages. Below is what they read. I'm not sure what I'm supposed to be seeing and hoping you can point me in the right direction. Thank you

O2 Sensor 1 before Cat - 2.02v didn't deviate much
O2 Sensor 2 before Cat - 2.09v didn't deviate much
O2 Sensor 1 after Cat - .75v dropped to 0v when braking
O2 Sensor 2 after Cat - .06v this never changed

Does Post Cat Sensor 2 need to be replaced?
June 7, 2016
  Followup from the Pelican Staff: post cat o2 2 does look faulty. I would replace it.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Izzyswift Comments: I am pulling two codes with my 08 323i.
I have;
P0036
P0160

Do I need to replace both or just the one sensor. It appears that one connection became undone underneath the car and dragged on the ground making the connection damaged.
June 6, 2016
  Followup from the Pelican Staff: Replace only the damaged one. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Haych Comments: Hi, I have an E92 N43 car. I have error codes which NOS sensor is damaged and Oxygen sensor is as well. When you say lambda does that refer to both items so will I just need to change a lambda sensor?
June 2, 2016
  Followup from the Pelican Staff: the Nox and o2 sensors are different sensors. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
chegg Comments: Hi
My car shows P0030 P0036, Bank 1 sensor 1, bank 1 sensor 2 heater control circuit failure, is this critical or just necessary to keep emissions down during cold start? Car runs fine.
Thanks
April 24, 2016
  Followup from the Pelican Staff: The heater is critical to keep the o2 sensor working all the time, not just during cold start.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Will Comments: I'm getting a code 2C3E after replacing o2 sensors before the CAT.
April 20, 2016
  Followup from the Pelican Staff: What is the vehicle? Are the cats BMW factory parts? - Nick at Pelican Parts  
Phil Comments: Hi, I have a 2007 335i .I have code P0420 and 0430 at the same time .I have reset the code and it came back about 50km . Should I replace the O2 first before replaceing the cat . And if replaceing the O2 ,do I replace the pre-cat or post-cat O2 sensor .Can you provide correct parts number of the O2 sensor for my E90 335i ,thanks..
April 17, 2016
  Followup from the Pelican Staff: These codes indicate faulty cats. O2 sensors will not fix these codes, you will likely need new cats.


Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Adam Comments: Hello, I have code P1130. Bank 1 sensor 1. My question is are all of these oxygen sensors the same? no different one for different places?
April 12, 2016
  Followup from the Pelican Staff: each sensor can be different sue to harness length.


Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
kody Comments: Hie I have a 323i its saying misfiring cylinder 3 and when driving once u step on the brakes to stop or turn it either switches off the engine or idling goes to near 0 and re increases on its own the idling is not smooth
April 11, 2016
  Followup from the Pelican Staff: If you have a misfire, I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts  
Jim R. Comments: I am having an intermittent rough idol to stalling that is throwing misfire codes on cyl.1,2&3. I checked my O2 sensors and post cat on bank 1 is fluctuating all over between 0.1-0.8v. bank 2 post cat is rock solid at 0.7. is this an indication of a bad cat or could it be the O2 sensor? sorry 2009 335i N54.

thanks for any help,
Jim R.
March 9, 2016
  Followup from the Pelican Staff: The sensor voltages you have are likely being displayed wrong, as your vehicle uses wide band o2 sensors. If you suspect the cat is causing the misfire, best bet is to check exhaust back-pressure at that cat. Remove the o2 sensor before it, and test with a back-pressure gauge. - Nick at Pelican Parts  
Mik Comments: Hey!
I just got the P2096 OBD II code and SES light on my '09 E90 with 96k miles on it. Would following this DYI fix my issue?

Thank you for your help!
March 7, 2016
  Followup from the Pelican Staff: It could. As long as there aren't vacuum leaks and the cats pass the emission monitor. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
workingonit Comments: I have an 07 528i e90. all o2 sensor codes are present 2c9e,2c9d,2c9f 2c9c. f04 fuse in engine compartment keeps blowing instantly. Ive inspected all sensor wires. Ive disconnected all sensors and fuse still blows. Any thoughts?
March 2, 2016
  Followup from the Pelican Staff: I would grab a wiring diagram and check all loads on the circuit. There may be a short in a component or the wiring harness. I would grab a repair manual. It will have the wiring.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
John Comments: Hello, I have 2007 x3 lci w n52 engine. It has service engine soon light on with code P112d for air fuel bank 2 sensor 1. Can I replace it and clear the code? Thank you.
February 21, 2016
  Followup from the Pelican Staff: Yes. Use the article you commented on for the steps to replace it. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
jose335i Comments: Hey I have a 07 335i twin turbo and I replaced all coils and plugs and 3 injectors and ran fine for a week and then I get p0300,p0301, p0302 and p0303...misfire again on same cylinders 1 2 and 3...u think that an o2 is bad now?
February 6, 2016
  Followup from the Pelican Staff: Unlikely, you probably have a base engine issue. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
Peter Comments: Hi,
I have a BMW 325i LCI from feb. 2010 with the N53 engine.

I just got the following error codes:

P2B07
P2B06
P2B05
P2AFB
P30DC

Can you tell me what those codes mean? The car uses too much gasoline lately almost 13l/100km
Regards
Peter
December 13, 2015
  Followup from the Pelican Staff: We don't have that engine here in the US, so my info does not show those codes. - Nick at Pelican Parts  
Isac Comments: Have 2007 bmw e90 328i N51 getting code 29F5 Catalytic converter conversion 2, reset code 3 times and keeps popping back up after drive cycle. I'm leaning towards bad cat.. And was wondering if this is the issue and which cat is bad?
November 6, 2015
  Followup from the Pelican Staff: Sounds like the rear bank cat is faulty. However, if one is bad, the other is right behind it. I would suggest replacing both.- Nick at Pelican Parts  
Mark Comments: Hello,
I have a code of P0155 which shows bank 2 sensor 1. What part do I need and do you have a picture of where this part is located?
October 30, 2015
  Followup from the Pelican Staff: That would be the oxygen sensor on the second back on the engine. You didn't mention what vehicle you have. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
failed nox Comments: hi,
just like you wrote "Oxygen sensors should be replaced every 100,000 miles" my car passed through 100.000 and got error

P2205 NOx sensor heater - open bank 1

now, the question to you gents is if this post relates to NOx sensor replacement or now ?

this is e92 n43 BMW

thanks in advance :
October 24, 2015
  Followup from the Pelican Staff: We don't have that vehicle in the US. The nox sensor is in the exhaust.- Nick at Pelican Parts  
jmarcum Comments: Should have mentioned that I am also getting 2CABH/11435 Undocumented Code
October 22, 2015
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
jmarcum Comments: 2008 335i 75,000 miles with code 2C3E O2 Sensor Before Catalyst 2, Cable Fault. Does this mean I just need to replace one of the sensors? If so which one? Part number?
October 22, 2015
  Followup from the Pelican Staff: The code is for one sensor, so replacing one should be ok. I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts
 
RG Comments: I'm trying to remove the pre cat sensor 2 cycl 4-6 but the mounting bracket is in the way - does this need to be removed and does anyone know what type / size bolts holding the mounting bracket on are? Any help much appreciated.

http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/ENGINE-Oxygen_Sensor_Replacement/ENGINE-Oxygen_Sensor_Replacement.htm
September 26, 2015
  Followup from the Pelican Staff: See this tech article:

http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/BODY-Exhaust_System_Replacement/BODY-Exhaust_System_Replacement.htm

For bracket info. - Nick at Pelican Parts
 
raix Comments: I got those codes:
2AF2 Nitrogen oxide sensor, lambda linear
2AF4 Nitrogen oxide sensor, electric
2AF6 Nitrogen oxide sensor, lambda binary

I have BMW 318i 2008 N43B20 105kw

Which sensor should be replaced?
September 22, 2015
  Followup from the Pelican Staff: That is the NoX sensor. Located in the exhaust. - Nick at Pelican Parts  
Abdul Comments: Hello Nick, Please can you tell me which particular sensor is failing based on the following error code 2C9F - Oxygen sensor heating after catalytic converter 2. I would be glad if you could attach an image pointing to it. I have a 2006 BMW E90 330I. Thanks.
September 20, 2015
  Followup from the Pelican Staff: The code is for the oxygen sensor on bank 2 behind the catalytic converter. I don't have a photo to share. - Nick at Pelican Parts  
Jj Comments: Thx u nick was helpful ill fix it aa soon as l get the,part!
September 18, 2015
  Followup from the Pelican Staff: Glad to help. - Nick at Pelican Parts  
Jj Comments: Hello nick l have the,same problem on a 07 335i twin turbo bmw as this guy lee but my question is the P0135 n P3026 code is the same oxigen sensor? N for wht l can see on my car there is one with a black cover n grey cover but wich is the one l need to replace black cover wired or the grey cover wired? N like lee said this two boys were on there good can l help please thx
September 17, 2015
  Followup from the Pelican Staff: These codes are for the oxygen sensor, bank 1 sensor 1. The front set of cylinders, sensor closest to engine. - Nick at Pelican Parts  
Dips Comments: Hi, Are sensors 1 and 2 the same part?
September 17, 2015
  Followup from the Pelican Staff: Not usually, but it depends on the model. - Nick at Pelican Parts  
Kath Comments: I have just had oxygen sensors bank 1, sensor 1 & 2 replaced. Do I need bank 2 sensor 1 replaced as there is a big difference in values in pics attached. Should they both be reading the same? Thank you :
September 12, 2015
  Followup from the Pelican Staff: A screen shot of o2 operation is not helpful, I would need to see sensor voltage over time.

However, rear o2 sensors switch less frequently and not very often. - Nick at Pelican Parts
 
Lee Comments: I finally got the two upstream Air/fuel sensors free! Those suckers were on there good! Original with 130k miles. I used a 22mm crowfoot attached to my Tq wrench so I can use the ratchet for getting the right angle. Whatever gets the job done : thank you for all your help!
September 8, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Lee Comments: Hey Nick, on my 08 335i, my SES light has came on for code "29E1 Fuel control 2 mixture". My idle will be fine at 600rpm and then the Rpms will dip down below 600 and have a shaky idle. It will correct it and then bump the idle to 700 and keep it steady. Now, I've seen that this is most likely an O2 sensor issue. If so, does "control 2" mean bank 2? So, pre cat, cyl's 4-6 O2?
September 4, 2015
  Followup from the Pelican Staff: Yes, bank 2. Could be a faulty AIr/fuel sensor. Just be sure there are no air leaks. - Nick at Pelican Parts  
Landon Comments: Hi! I have a 2009 328i sedan, SES light on and this code:
- Fault: Lambda probe front catalyst, adjustment control
- Code: 002C31

Is this a bad pre-cat bank 1 o2 sensor, and is it odd to go bad at 54K miles? Always used premium gas. Thanks!
August 25, 2015
  Followup from the Pelican Staff: What is the P-code? Could be a faulty sensor. From the sound of the code. - Nick at Pelican Parts  
Lee Comments: Hey Nick, I was able to get to the o2's by removing the small heat shield from the bottom and sticking my hand through the small hole to then reach the o2's. After I sprayed PB blaster on them and let them sit, they still won't come loose when I use my 22mm stubby wrench on them. If you're looking at the O2, im making the O2 rotate to the left to loosen. Any tips you can suggest? These are originals with 129k miles on the clock. 2008 335i N54
August 12, 2015
  Followup from the Pelican Staff: Left or counterclockwise, correct.

They can be pretty tight. I use a 22mm crowfoot with a 1/2 breaker bar when they are super tight. If you are replacing them, you could also break the sensor top off, then use a 22mm socket on the hex. - Nick at Pelican Parts
 
Lee Comments: Thanks Nick - my comment is below. What about that heat shield that runs right along that side of the inner fender liner where the o2's are? Does it unbolt on the bottom of the sheild so I can reach in and change them?
July 15, 2015
  Followup from the Pelican Staff: Yes. As I recall, the tie rod may have to be removed to get it out. The heat shield is held in by 10mm fasteners. - Nick at Pelican Parts  
Lee Comments: Nick, how do I get to the pre cat O2's on a 335i? Also, what wrench size do I use? The O2's cannot be reached from the top as you're doing on this e90.
July 12, 2015
  Followup from the Pelican Staff: An o2 sensor socket, crows foot works. The hex size is 22mm. You have to get them through the wheel well. Remove the inner fender liner. - Nick at Pelican Parts  
tpet84 Comments: Hi I am trying to find which fuse is for the oxygen sensors. I am trying to remedy a P0050 fault code which is for bank 2 sensor 1 oxygen sensor. I've got a replacement sensor but before I get into that I would like to make sure it is not just a fuse first. Also, does anyone have a good link to show the best steps for replacement?
Thank you
Also, this is for a 2008 328i
June 30, 2015
  Followup from the Pelican Staff: Fuse 16, 10 amp powers all the heaters.

The steps for replacement are in the article you commented on.- Nick at Pelican Parts
 
tpet84 Comments: Hi I am trying to find which fuse is for the oxygen sensors. I am trying to remedy a P0050 fault code which is for bank 2 sensor 1 oxygen sensor. I've got a replacement sensor but before I get into that I would like to make sure it is not just a fuse first. Also, does anyone have a good link to show the best steps for replacement?
Thank you
June 30, 2015
  Followup from the Pelican Staff: Fuse 16, 10 amp powers all the heaters.

The steps for replacement are in the article you commented on.- Nick at Pelican Parts
 
Kyle Comments: 2008 335xi

Hi, I am getting a p112f code.

This post http://www.e90post.com/forums/showthread.php?t=135379

suggests that it could be an o2 sensor fault.

I am getting an intermittent "engine malfunction."

Do you think this is o2 sensor related?
June 29, 2015
  Followup from the Pelican Staff: I think that fault code is for map sensor pressure vs throttle angle. Could be an issue with manifold pressure not as expected. - Nick at Pelican Parts  
Daniel Comments: Are the sensors different then? How come I'd need to move the wiring? Was just going to move the sensors and see if I then got lean on bank 1? Any other suggestions?
June 29, 2015
  Followup from the Pelican Staff: Right, move the sensor in the exhaust. Then switch the wiring. You won't be able to run the engine just by switching the wiring, if that is what you expect to do. The engine will not run well enough for testing. - Nick at Pelican Parts  
josh335i Comments: Would this cause misfire on cylinder 1,2 and 3 if bank 1 is down? As I have no spark to cylinder 1,2 and 3 see and this code come up..
June 26, 2015
  Followup from the Pelican Staff: Not likely. I would check for fault codes to begin with. What are the codes stored? - Nick at Pelican Parts  
Daniel Comments: Forgot to say it's a 2006 model n52 engine.
June 25, 2015
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
Daniel Comments: Hi I am getting p0174 bank 2 system too lean on my bmw 325i touring, I have replaced maf and had a smoke test done. I get some hesitation on acceleration, could I swap the two pre cat sensors and see if the fault follows or is there any other causes of this fault?
June 25, 2015
  Followup from the Pelican Staff: You could swap them if the wiring harnesses reach. You would have to physically move them in the manifold, then the wiring. - Nick at Pelican Parts  
Paul Comments: Hi,

I need the part numbers for both 02 sensors...pre and post for a 09 335i.

Thanks for your help.
June 18, 2015
  Followup from the Pelican Staff: I’m not the best with part numbers, and they vary depending on VIN.

Not 100% SURE on these numbers:


01 REGULATING LAMBDA PROBE L= 1400MM 1 11787558055
02 REGULATING LAMBDA PROBE L= 1200MM 1 11787558087
04 Lambda Monitor sensor L= 560MM 1 11787545074
05 Lambda Monitor sensor L= 490MM 1 11787545075



Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts
 
Brian Comments: Hello,

I'm having trouble figuring out which sensors to buy. I notice there are the "normal" ones, and then there are the wide-band 5-wire sensors. I believe this is the difference between California and non-California emissioned vehicles.

Is that the case? I have a US-Spec 2006 330i 6MT.

Thank you,
Brian
June 15, 2015
  Followup from the Pelican Staff: I would need the last seven of your VIN. However, I believe all US E90s had wide band sensors. - Nick at Pelican Parts  
Dips Comments: Hi Nick, Thanks for the response and a great website!
Is this bank 1 sensor 1 or 2?
Many thanks
June 5, 2015
  Followup from the Pelican Staff: The code says it is bank 1 sensor. - Nick at Pelican Parts  
Dips Comments: Hi, I have checked the codes with INPA and im getting errors
P122C, P121F and P122F. which sensor would this be?
I have a BMW 325I e92 N53 2009
Many thanks
June 4, 2015
  Followup from the Pelican Staff: These codes usually point to a faulty NOX sensor.

P122C NOx sensor (Bank 1) - Short circuit
P121F NOx sensor linear lambda signal circuit (Bank 1) - Short circuit
P122F NOx sensor binary lambda signal circuit (Bank 1) - Short circuit - Nick at Pelican Parts
 
livnjak Comments: I will buy a new one,the car has driven 234000 km.
Probably it is a sensor fault.I make a new scan with disconnected sensor and it´s still shows 0 V on B1 S2
But I can see that is not a same sensor as on your´s Picture.
Those to sensor are same,it´s only cabel that is longer on one off them.
Thank you for helping us!
June 4, 2015
  Followup from the Pelican Staff: It's possible the wiring to the DME is shorted. I would check it before replacing another o2 sensor. - Nick at Pelican Parts  
livnjak Comments: Hello!
I have a BMW E90 320i from 2005.
I run scan and it shows :
Bank 1 Sensor 2 - Oxygen Sensor Output Voltage : 0,00 V
I think I need a new sensor. Do you think so?
Thanks
June 3, 2015
  Followup from the Pelican Staff: It could be. I would check sensor voltage at the DME to be sure. Just to be sure the wiring isn't damaged. It however is likely the sensor. - Nick at Pelican Parts  
Dips Comments: Sorry forgot to mention I have a
BMW 325i N53 3.0 engine
June 3, 2015
  Followup from the Pelican Staff: Ok, got it. - Nick at Pelican Parts  
Dips Comments: Which sensor would this be Code: 0030DC?
June 3, 2015
  Followup from the Pelican Staff: That code doesn't show up for me. It's possible it was displayed incorrectly. Can you retrieve the P-code from it? Scan the generic side. - Nick at Pelican Parts  
Josh335i Comments: Thanks for reply.. would this cause car to idle rough also? Thanks
June 3, 2015
  Followup from the Pelican Staff: Yes, a vacuum leak can cause a rough idle. - Nick at Pelican Parts  
josh335i Comments: Hi I have a bmw 335i sedan. Borrowed a mate code reader and it give me these codes.. Any idea what they are please.
Manufacturer control p10a5
Manufacturer control P3283
System 2 lean p0171
Random multiple cylinder misfire po300
Cylinder misfire codes for cylinder 1,2 and 3.
Any advice where I can start would be great full thanks josh
June 3, 2015
  Followup from the Pelican Staff: These are fuel trim faults. Check the intake air system for leaks and operation of the mass air flow sensor. - Nick at Pelican Parts  
Marvo Comments: I have a bmw e90 330i 2007 n54,which on cold start, runs extremely rough like several cyclinders are misfiring. Then 2 minutes later it settles down and is almost fine. I have replaced plugs filter coils and nox sensor and new vanos full kit. Cleaned Maf and vanos solenoids. Still as bad. Throws fault on OB2 Tool, saying post cat lamba sensor failure and cyclinder 5 combustion failure.Also checked DISA and Valvetronic both OK. I've run out of ideas or could it just be the lamba causing this.
May 20, 2015
  Followup from the Pelican Staff: I would perform a fuel delivery system test. Check fuel pressure, volume and quality. You could have a faulty fuel pump. if the fuel pump checks out, I would check spark, fuel and compression on all cylinders to find the cause of the misfire on cylinder 5.
- Nick at Pelican Parts
 
Sammi Comments: Sorry not sure if the picture loaded from diagnostic? but initially the problem on my car was all steering around the vanos unit... this has been eliminated since i cleaned the solenoids out checked all sparks coils and changed oil/filter... so as of yesterday it P0420 P0430 catalyst system below thresh hold bank 1 & 2
May 8, 2015
  Followup from the Pelican Staff: Catalyst efficiency faults indicate faulty catalytic converters. You can test exhaust gas pre- and post-catalyst to see if they are reducing emissions enough. - Nick at Pelican Parts  
Sammi Comments: Hi there ive had so many problems with my 2008 320i msport all sorts of fault codes flown up over months have had nox sensor and exhaust cam shaft sensor replaced which did nothing,,have cleaned out solinoids and did another oil change with 0w 40 and a month later goes into limp mode half engine management light .. also changed the timing tensioner because it was advised on being upgraded .. anyway im thinking something on the lambad or cat is now an issue these are new fault codes taken yesterday on diagnostic,,, loss the will to live with this car, please help

Cheers Sammi
May 8, 2015
  Followup from the Pelican Staff: Catalyst efficiency faults indicate faulty catalytic converters. You can test exhaust gas pre- and post-catalyst to see if they are reducing emissions enough. - Nick at Pelican Parts  
myle Comments: 2008 328i code P0422. Main Catalyst Efficiency Below Threshold Bank 1. Is this possibly the O2 sensors or cat converter?
April 28, 2015
  Followup from the Pelican Staff: More likely the cat. As the o2 sensor has to pass a test before the DME will test the cat. - Nick at Pelican Parts  
Vince Comments: Lean on bank 1 and 2 at idle Codes P0171 and P0174. I was told check MAF which I did. Also checked plugs and coils. Next thing was O2 sensors pre cat unless you have another suggestion.
March 24, 2015
  Followup from the Pelican Staff: How have you determined your engine is lean? When is it lean? idle, steady cruise, etc? Different components affect different engine operating ranges. Check the fuel trim and report back when it is lean. - Nick at Pelican Parts  
Vince Comments: I am getting lean on bank 1 and bank 2 on my 06 325i. Slight misfire on startup also. I have checked the MAF sensor and this was my next option. In your opinion, could this be the culprit?
March 23, 2015
  Followup from the Pelican Staff: How have you determined your engine is lean? When is it lean? idle, steady cruise, etc? - Nick at Pelican Parts  
Damion097 Comments: Hi on my 2007 e90 for bank 2 sensor 1 there is this metal piece right above the sensor not sure how to get around it. Any ideas
March 11, 2015
  Followup from the Pelican Staff: Are you referring to the foil shield? If so, you can try to slide it up or compress it enough to get the socket onto the sensor. - Nick at Pelican Parts  
Adrian Comments: Hi! Which one is the NOX sensor in a 320i 2009? Thank you.
March 5, 2015
  Followup from the Pelican Staff: It would be in the exhaust. However, we don't have that vehicle here, so I can't give you an exact location. - Nick at Pelican Parts  
Louis Comments: Hi,
Thanks a lot for this write up. I have a 2008 335xi. I went to bmw and read the codes. I got 002c39, 02c3d, 002caa, 002c9c all talking about oxygen sensor before catalytic converter fail. Questions
Which sensors I am I replacing?
Will you recommend me to replace both
Bank1, Sensor1 and Bank1, Sensor2or Bank1, Sensor2 and Bank2, Sensor2?
Thanks for you help
March 4, 2015
  Followup from the Pelican Staff: What are the code descriptions? I would need the last seven of the VIN to see what the codes are referring to. - Nick at Pelican Parts  
Ckleiv Comments: Hi. Have e92 n43b20a 08.
Fault code p136 but no text.
I think this is o2 sensore b2s2? And its the sensore whit 4 sticks?
On my scope it stands on 1196 mv. Not moving. And b1s1 its around 400 +/-.
February 13, 2015
  Followup from the Pelican Staff: You're missing a digit from the fault code. Assuming you may have a P0136, that is an o2 sensor circuit code for bank 1 sensor 2. - Nick at Pelican Parts  
Bmwhitman Comments: Thanks Nick. Just to clarify your comment:

"Oxygen sensor behind catalytic converter. This would the sensor for the rear bank of the engine, sensor behind the cat"

Is this sensor #2 underneath the car?
February 9, 2015
  Followup from the Pelican Staff: Yes, rear bank, behind the cat, under the vehicle. - Nick at Pelican Parts  
Bmwhitman Comments: I have a hard fault with a check engine light today. After scanning with my BT scan tool I had the following fault:

2C7F:
2C7F Lambda probe behind catalytic converter 2, trimm control
Error will cause a warning light
Error is not currently present
Test conditions have been completed
Signal or value below threshold

Which Oxygen sensor are they referring to? Does "Lambda probe behind catalytic converter 2", mean I need to replace Bank 2, sensor 1 since it's behind catalytic converter?
February 8, 2015
  Followup from the Pelican Staff: Oxygen sensor behind catalytic converter. This would the sensor for the rear bank of the engine, sensor behind the cat. - Nick at Pelican Parts  
Fredrik Comments: Hi,

and thanks for a great write-up. Like Chris, I have an E92 335i and need to replace the second pre cat sensor.

You mention that the sensors are located in a different place on the 335. Is it still possible to change the b2s1 sensor without a ramp or lift?

Thanks,
Fredrik
January 27, 2015
  Followup from the Pelican Staff: Precat you should be able to get from the top, on turbocharged models. The post cat sensor need to be loosened from below. - Nick at Pelican Parts  
Aaron Comments: Great article!

I have a 2007 328I. Right now, it pulling 4 codes, P0031, P0037, P0051, and P0057, heated oxygen sensor control circuit low. I checked the EBox and the fuse is blown and it keeps blowing. I inspected the wiring on all 4 sensors and don't notice any issues with the wiring around the sensors. I unplugged all 4 O2 sensors and the fuse still blows. Do you guys have any ideas? Is there anything else I can check? Any help would be greatly appreciated.
January 26, 2015
  Followup from the Pelican Staff: Look for the harness making contact the engine or exhaust. It sound like it is shorted all the time. Shouldn't be too bad to find. - Nick at Pelican Parts  
Ian Comments: Hello,
I am unsure of which O2 sensor to order.
I have a faulty Bank2 Sensor 2.
Is this the Bosh Downstream 16795 or the Bosh Upstream 17098 part?
December 22, 2014
  Followup from the Pelican Staff: Not sure what vehicle you have, so I can't be sure myself. For a fast repsonse, give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
David Comments: I am after oxygen sensors to suit a 2008 320i e 90 sedan , I haven't been able to find them on your listing
October 12, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
pinoye90 Comments: 2ca7 and 2ca95 both say lambda probe heating in front of catalytic converter 2
input signal error will cause warning light. errors is not present test conditions have been completed time out. causing service engine soon even after clearing out codes with bag-tech scan tool??? help do my sensors need to be replaced and which once??
September 5, 2014
  Followup from the Pelican Staff: I don't know if they indeed require replacement. Check sensor operation. You are dealing with the two sensors before the catalytic converters. - Nick at Pelican Parts  
Val Comments: Man my question messed up, i need bank 1 sensor 1. Which one is that, #4 or #5 on diagram
June 11, 2014
  Followup from the Pelican Staff: Sensor 1 is b1s1, sensor 4 is b1s2. - Nick at Pelican Parts  
Val Comments: Recieved a reply but can't seem to locate the answer when clicking the link. Just trying to see on a turbo model, oxygen sensor bank 1 and bank 2 is to which diagram pic #4 or #5. Which 1 is sensor 1 and 2. Also where. Is it located, passenger side or driver. Sorry to ask
June 11, 2014
  Followup from the Pelican Staff: Sensor 1 is b1s1, sensor 4 is b1s2. - Nick at Pelican Parts - Nick at Pelican Parts  
Val Comments: Which 1 on turbocharged models is 4 and 5. Which 1 is bank 2 sensor1 or 2??
June 11, 2014
  Followup from the Pelican Staff: Bank 1 is cyl 1-3 and back 2 is cyl 4 - 6. - Nick at Pelican Parts  
razagtr Comments: Hello!

Can I use pre-cat sensors for post-cat in 335i?
June 9, 2014
  Followup from the Pelican Staff: No, they are different. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Kayla Comments: Does this apply to 328xi? If not, can you direct me to the post that does.
March 31, 2014
  Followup from the Pelican Staff: What is the year and model of the vehicle?
- Nick at Pelican Parts
 
Chris Comments: Thanks,but I got it replaced one week ago now.But thanks anyway. :
March 16, 2014
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
Chris Comments: Hello!

I need to replace my oxygen sensor 1 on bank 2 on my BMW 335i coupe from 2007.
But when I look at your perfect DIY,the photos won't match with the way my engine looks like. The sensor is not visible after I have removed the cover.

Hope you can help me, thanks in advance!

Regards
Chris
March 3, 2014
  Followup from the Pelican Staff: On turbocharged models, the sensors are located in a slightly different place. See attached image, sensors 4 and 5 are post cat sensors. - Nick at Pelican Parts

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