Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
Bookmark and Share

Pelican Technical Article:

MAF Sensor Replacement

Time:

30 minutes30 mins

Tab:

$400

Talent:

*

Tools:

Phillips head screwdriver

Applicable Models:

Mercedes-Benz E320 (1996-97)

Parts Required:

New MAF

Hot Tip:

Do not use oiled filters

Complementary Modification:

Replace air filter

The mass air flow sensor (MAF) is located inside the engine compartment and is used to measure the amount and temperature of air that is entering the engine at any one time. Older style meters used on fuel injection systems in the 1980s measured air volumetric flow, which worked fine but then you also needed a separate sensor to figure out how cold or dense the air was. The mass air flow sensor senses the total amount of air passing the sensor and allows the fuel injection system to adjust the fuel mixture to compensate for cold weather and/or high altitude conditions. The MAF also incorporates an internal intake air temperature sensor which measures the temperature of the intake air.

The first indicator that you might have a problem with the MAF is the presence of a check engine light (CEL) on your dashboard. The check engine lamp can be caused by a wide variety of problems with the engine: you need to read the codes from the computer to get a starting clue as to what the problem is. However, the engine will not be operating at peak efficiency, and you will most likely experience a loss in power and a decrease in gas mileage as a result. It's best to get the problem taken care of relatively quickly, as running the engine in this condition can potentially cause damage to other components like the catalytic converters.

The computer will know if something is wrong with the MAF because it will compare the values being output by the sensor to "expected" values that it should be receiving. This common-sense check by the computer helps to diagnose problems with every component in the system. If the MAF becomes dirty and is falsely indicating to the engine that the car is receiving very little air while at full throttle, then the computer will most likely kick back an error code.

Vacuum leaks and other air leaks in the system can cause MAF sensor errors. If you have a crack or leak in your air intake downstream of the sensor, then the MAF will be sensing less air than the engine is actually receiving. If the clamp on the throttle body happens to come loose and fall off, then the MAF will indicate almost no air being sucked through the intake, yet the engine will be sucking air directly from the engine compartment into the throttle body. The bottom line is that you should carefully inspect all of your hoses, clamps and intake tubes for air leaks prior to replacing the sensor.

After you have replaced or cleaned the sensor and cleared the code, you need to go drive the car and see if the code returns. If the same error code appears, then the problem probably lies elsewhere. Most of the time when you have an error code indicating a problem with the mass air flow sensor, it is usually solved by the installation of a new sensor. However, the computer can become confused sometimes and give misleading error messages. Wire harness issues, DME problems, and secondary air injection equipment problems may all give false MAF error codes. At this point, it's best to dive into the factory manuals and start going through the laborious test procedures contained in there.

Figure 1

Here is a new MAF sensor housing

Shown here is the MAF sensor housing (green arrow) located in the intake on the W210 Mercedes.
Figure 2

Shown here is the MAF sensor housing (green arrow) located in the intake on the W210 Mercedes.

Squeeze the two tabs (green arrows) on the electrical connector together to release it from the MAF sensor.
Figure 3

Squeeze the two tabs (green arrows) on the electrical connector together to release it from the MAF sensor.

Release the two clips on the top and bottom of the MAF sensor housing (green arrows).
Figure 4

Release the two clips on the top and bottom of the MAF sensor housing (green arrows). Pull the end of the MAF sensor housing out of the airbox.

Loosen the hose clamp on the other end of the MAF sensor housing to release in from the intake hose (green arrow).
Figure 5

Loosen the hose clamp on the other end of the MAF sensor housing to release in from the intake hose (green arrow). Pull the MAF sensor housing out of the intake hose.

Shown here is the MAF sensor housing removed from the intake.
Figure 6

Shown here is the MAF sensor housing removed from the intake. Replacement is the same as removal, slide the new unit in and reconnect the clamps and electrical connection

Bookmark and Share
Comments and Suggestions:
Wingfield Comments: Hai Nick.
My Mercedes E320 CDI 2002 suddenly developed a hard start one morning after having travelled on a journey of 430kms one way. I checked the high pressure pump and there was less fuel coming out. Today, i unplugged the mainin fuel line from the fuel filter holder. To my surprise i found it was dry even after several cranks. No fuel coming to the system.
Is there another pump either near or within the tank that could be the cause? Because i suspect the high pressure pump can't do the job alone. I checked for the other electrical pump, but couldn't locate it.
Kindly advise me on the above and give me the part number for the electric pump.
Chasis: WDB2100262B441580
Many thanks in anticipation.
October 24, 2016
  Followup from the Pelican Staff: There is an in-tank pump as well. - Nick at Pelican Parts  
Wingfield Comments: Hai Nick. I am the one who wrote to you about the damaged high pressure common rail pump for Mercedes Benz E320 CDI 2002.
Thankyou for your response.
Kindly help me with information on how i can purchase a brand new or good used one from your site and the cost.
The part number is 6130700001 and the chasis number is: WDB2100262B441580.
Your help would be highly appreciated.
October 21, 2016
  Followup from the Pelican Staff: I’m not the best with part numbers.


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
 
Wingfield Comments: Hai Nick.
My Mercedes E320 CDI 2002 would stall whenever i slowed down.
I followed your advice and found the main fuel line under was hit and pressed by a stone.
I had it rectified.
Few days after, the high pressure common rail pump started failing to pump fuel and start the car.
What can be done to rectify the problem.
Lastly, a few months back, fuel started to leak through the vacuum solenoid valve and mechanic had no choice but to connect it to return line to avoid spillage.
Your advice is ever appreciated.
My chasis is WDB2100262B441580
October 19, 2016
  Followup from the Pelican Staff: If the delivery of fuel to the high pressure pump was restricted, the high pressure pump is likely damaged. I would assume you need a new high pressure pump. - Nick at Pelican Parts  
Wingfield Comments: Hello. Am back again.
I have a mercedes E320 CDIW210.026.
I had it diagnosed, and found the following fault codes: 1 P0100 - MAF error
2 P1354 - deflection angle between camshaft and crankshaft sensors.
3P1403 - Exhaust gas
4P1817 - reverse light switch
5B1315 - faulty front passenger seat
6B1010 - low supply voltage of control unit.
I replaced the maf sensor with a brand new one but it still stalls after starting and idles rough.
Currently, the radio doesnt work only shows "wait" because i entered a wrong code several times. It was supposed to automatically restore and ask for the code, but its stuck on the "wait". What do i do?
Kindly advise me on what i should do so that these faults do not return.
Thanking you in anticipation
October 3, 2016
  Followup from the Pelican Staff: The stall and camshaft faults are likely related to the timing issue noted by code P1354.

The others are likely reverse light bulb or switch. Passenger seat SRS component. Battery voltage issue to a control module, low battery charge. - Nick at Pelican Parts
 
WIngfield Comments: Hello Nick.
I wrote to you earlier that my mercedes E320 CDI went into limp mode. It was diagnosed and gearbox function restored. The MAF snesor was replaced with a brand new one, but the engine stalls at certain times after starting. What is the normal idling and what could be causing it to stall?
Thanking you in anticipation
October 2, 2016
  Followup from the Pelican Staff: Usually a stall is from the idle control circuit not working, vacuum issue or lack of fuel. Normal idle should be around 850 RPM.- Nick at Pelican Parts  
Wingfield Comments: Hello.
The aircon for my mercedes benz E320 CDI 2001 produces a mixture of both cold and hot to hot air at the same time even when the aircon switch is set on cold.
What could be the problem?
September 27, 2016
  Followup from the Pelican Staff: The blend door or heater valve may be faulty. - Nick at Pelican Parts  
Jose Comments: Hi. I have a CLK 320 1998. I already clean the MAF sensor. But trying to connect back the hose from the MAF to the motor is almost impossible. Do I have to use pressure to put it back? I'm afraid to break something.
February 11, 2016
  Followup from the Pelican Staff: Make sure the clamp is loose, then use a small amount of dish soap to lubricate the duct and slide it on. - Nick at Pelican Parts  
Mike Comments: I need help!!!does anyone know Where is the map sensor located in a 2007 Mercedes s550 w221
January 13, 2016
  Followup from the Pelican Staff: If I remember correctly, it is on an intake air duct. - Nick at Pelican Parts  
Mercedes s320 2002 Comments: It was the crank sensor thank you so much 😊
But after fixing that now the dashboard is off and the front head lights are always on what would it be ?
December 23, 2015
  Followup from the Pelican Staff: Could be a faulty headlight switch. - Nick at Pelican Parts  
Mercedis S320 2002 Comments: I have a mercedis s320 when temprature goes abive 95c it dies and wont be able to start it till its below 80 c
I did change fuel pump and filter as Ive been told they might be the reason.
Please advise.
December 19, 2015
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose. - Nick at Pelican Parts  
B.A Comments: I have A W210 elegance 2.00 litter 1997 model, for the past few years I have found out that it the idle meter fluctuates slightly when the engine reaches the normal temperature and it stalls mainly at traffic lights as I go to pull away. I have had the MAF and the throttle body changed but the problem is still there. Please advise.
December 1, 2015
  Followup from the Pelican Staff: This could be a vacuum leak or a faulty idle control. I would start by confirming the intake ducts are crack free and he engine has no vacuum leaks. - Nick at Pelican Parts  
David Comments: Nick,

I have a 1998 e240.

In cold temperatures approx 46 deg engine starts as normal and then quickly looses RPM and idles very roughly until the engine stops. During loss of RPM pressing accelerator pedal does nothing. I have to start car 5 or 6 times and eventually manage to get it going. Other problems during the cold include occasional engine surge and slight delayed acceleration on kickdown. When engine warm all appears fine.

Error codes P0130, P0150, P0170, P0173.

The temp sensor has been replaced and vac hoses checked for leaks. Fuel filter replaced, engine cleaner used, and MAF aftermarket part and throttle body have been cleaned.

This has had no effect and the problem persists however. Should I replace MAF / O2 sensors, any ideas?
November 13, 2015
  Followup from the Pelican Staff: Could be an air leak or fuel delivery issue.

When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
John Comments: I have a 1997 E420, and while on a trip the engine started stumbling and pinging above 4000rpm, then a loss of power. The check engine light came on and I got codes for random misfires and got P0173 code. I have cleared the codes and replaced the MAF and mounting boot. I still have the same problem though. I can accelerate, but it has a lack of power, and falls on its face just above 4000rpm. The car idles, but just a little rough. The CEL is not lit. Do you have any other suggestions on what to check?
October 19, 2015
  Followup from the Pelican Staff: Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders.
- Nick at Pelican Parts
 
Shawky elhabashy Comments: Mr; PL my m.b s320 from the beginning there
was missing hose coming from the intake topping
The throttle body going to the right side of the
Intake I believe it is called intake air cleaner
Hose. The car was running without it for some time
About one foot long , now since i"m going to change
The maf sensor should connect that hose
I appreciate UR qui K response.
Shakie
Texas
September 22, 2015
  Followup from the Pelican Staff: Yes, connect the hose. - Nick at Pelican Parts  
Shawky elhabashy Comments: How to clear the error code after I change maf sensor , is that done by machin or enough by resting the battery ?
A mechanic told me just take the negative off
For 10 m will do it is that right ?
Thank
September 22, 2015
  Followup from the Pelican Staff: Best way is to clear it using a scan tool. Removing the battery cable will clear adaptations. - Nick at Pelican Parts  
Gi Comments: My bnz e240 w210 1999mod. 33000km on odometer readingnot tampered.Car problem is only During engine is cold either on P& D modeor just newly started & temp gauge is 20-80deg.
When I step on accelerator pedal, the rpm tends to go down to 0 rpm & hardly incresing up sometimes characterized w/ a backfire.Until the engine will turn off w/ lean fuel..However, wen u step on accelerator pedal on a subtle manner as if it's grasping for more air, the engine will recover normally to 8000 or higher and the engine will not stop.
On driving mode D. While driving at 20-80deg temp gauge the car accelerates poorly.When I try to give more fuel the engine will totally stop.It seems that there is a poor intake of air for combustion.I tried to hav it scan diagnosed w/ a star diagnostics for 3x with different scanners but there is no any fault coming out from the system despite its poor acceleration when cold.
When engine is warm & at normal operating temp or at 85-95deg, acceleration becomes more better close to normal but at still hav little delay for acceleration but unlike when the engine is cold which is very very poor. I suspect it has a faulty MAF even if it's not coming fr the scanner. I replaced it w/ a brand new one. Outcome becomes worse.Plan B,I tried using a used normally working MAF from another same benz model but still worse same as the new MAF. No positive changes. From this point I believe the engine is not accepting the new MAF. Instead i brought back d old MAF.Does it need a computer adaptation or program resetting for a new MAF when it will be installed or is it just simply a plug & play electronics sensor equipment. I also tried to replace the camshaft position sensor but still have same problem. Engine restarting is no problem. Engine idle is normal.RPM indicator is not showing any erratic up&down motion.
I'm using a 97octane fuel.Air filter new, 12pcs spark plugs changed orig, Fuel filter new, Fuel pump new, Throttled body cleaned and inspected.Air lines & hoses are in good condition. Old MAF also cleaned.
August 5, 2015
  Followup from the Pelican Staff: This sounds like a large vacuum leak. I would start there. Check the fuel trim readings at idle to see if the engine is running lean. - Nick at Pelican Parts  
Johnny Comments: I have a 1998 Mercedes slk 230 when I put my car in the on position my radiator fan turns on at full blast and doesn't turn off and doesn't let the car start at all. I have noticed that my car has been doing this at random times for the past couple months But it always started up in a couple minutes after the fan Stop. I have been looking into forums and they say it could be my mass flow air sensor BUT my check engine light never popped up only when I disconnected the sensors plug it did
August 4, 2015
  Followup from the Pelican Staff: Use a scan tool and check engine temp when the problem is present. If the sensor is faulty and reading too high, the fan will run at high speed. - Nick at Pelican Parts  
BOB Comments: My car is a 1997 s320 with the straight 6 cylinder and like I said I replace the MAF sensor and it still runs like hell it won't idle and then dies out I put the old sensor back in and it runs fine but the check engine light still indicates a code for the mass airflow sensor
July 19, 2015
  Followup from the Pelican Staff: The fault code number would be helpful.

It is possible you have a leak in the intake ducting, setting a maf fault when there isn't a fault with the maf. - Nick at Pelican Parts
 
Bob Comments: I replaced the maf. Sensor now car idles rough and then dies
July 18, 2015
  Followup from the Pelican Staff: What type of vehicle?

Check the DME for fault codes and confirm the intake air ducts are sealed. - Nick at Pelican Parts
 
Shyam Comments: Hi Nick,

Thanks for responding but "It should be in the duct directly after the throttle housing" did not really answer my question: "Is the intake air temperature sensor for the Mercedes Benz C230 2002 in the Mass Air Flow sensor housing?" Yes? No? Is it a separate piece by itself not with mass air flow sensor?

Thanks
July 17, 2015
  Followup from the Pelican Staff: I described the location. it is mounted in the location I described as a separately serviced component. - Nick at Pelican Parts  
Shyam Comments: Is the intake air temperature sensor for the Mercedes Benz C230 2002 in the Mass Air Flow sensor housing?
July 16, 2015
  Followup from the Pelican Staff: It should be in the duct directly after the throttle housing. - Nick at Pelican Parts  
michaelz Comments: HI NICK MY 1996 W202 WHEN YOU DRIVING SMOOTH & just loose power and the rev counter gauge go up & down most of mechanic they don't find problem seems like is loosing air or timming or air mass sensor problem
July 16, 2015
  Followup from the Pelican Staff: Are you sure it isn't a transmission slip? Is the check engine light on? - Nick at Pelican Parts  
Robert Smith Comments: I have a 1994 R129 320

It goes fine until it gets hot then only when coming to a stop the engine idle speed goes up and down 500 - 800 - it doesn't stall - as soon as you are underway its fine -I reckon it may be using more fuel
July 5, 2015
  Followup from the Pelican Staff: Could be an idle control issue. if the engine is running well and not misfiring, check the idle control circuit. - Nick at Pelican Parts  
TPZ Comments: Hi there, thank you for the reply.

I visually checked all hoses and all the air admission path, and i can see nothing :

How can I check and find an air leak ?

Thank you men !
July 1, 2015
  Followup from the Pelican Staff: A smoke machine is your best bet. - Nick at Pelican Parts  
TPZ Comments: Hi there and big thanks for your help !

Its on a 109CDI Vito '07.

I watched everywhere, and i don't see any damage, clamp or nothing bad on air intake. When i take a software measuring tool with a ODB interface, the MAF seem to have correct values.

I read somewhere that a stuck open EGR Valve could be the source of this code too. What do you think of that ? - I'm about to make an hydrogen engine cleaning to see if my problem will be solved, but i'm not so sure... :
June 22, 2015
  Followup from the Pelican Staff: If the EGR was stuck open, the engine would stall at idle. - Nick at Pelican Parts  
TPZ Comments: Hi there !

I got the P0101 Code and the the CEL when leaving the fuel station. I changed the MAF and the CEL is STILL ON whith the same code. If I erase the code, the power is back and I can drive normally. Next start of the engine, and CEL is back and limp mode is back... :


Is there a calibration to make ? How to make it myself ? Thank you men !
June 18, 2015
  Followup from the Pelican Staff: Could be an air leak as well.

What vehicle are you working on? - Nick at Pelican Parts
 
computer Comments: My 1998 c230 is difficult to start when ever it is cool. My mechanic suggested that plugs should be changed and nozzles serviced. It continues to behave the same way. Now he says the air flow meter has to be changed. Could it be the air flow meter fault? If it is, can't it be serviced without having to replace it?
April 23, 2015
  Followup from the Pelican Staff: Have you confirmed proper spark and fuel pressure when the hard start is present? - Nick at Pelican Parts  
greg Comments: 1991 mercedes benz 300E fuel tank removal
April 10, 2015
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

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
 
James Comments: I have a 1992 SL500 . Can you tell me what the MAF calibration should be? That is to say, what the OHM resistance should be at the zero point? While the car is not running.
Thanks!
February 23, 2015
  Followup from the Pelican Staff: I don't have a resistance spec for that sensor, as I have never tested them that way. I am also limited on Benz specs.

Check the airflow using a scan tool. What is the mass reading at idle, and at a steady cruise at 2500 RPM? - Nick at Pelican Parts
 
Gustavo Comments: Great tutorial and i'm ready to buy a new MAF for my1998 E320.
I want to know if the MAf sensor can cause troubles with the transmission. Like a when you desacelerate and try to acelerate again the RMP go up nut the car don't move and also special in cold the shifts go just to 3rd

Thank you
January 24, 2015
  Followup from the Pelican Staff: Improper load readings can cause shift issues.

First check the transmission fluid level to be sure it is correct. Then check the transmission ECM for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts
 
Ron Comments: I would like to order this part assembly but do not know what it is called. Can you helps. See photos
December 24, 2014
  Followup from the Pelican Staff: What vehicle are you working on? Can you back up a bit so I can see more of the engine? 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
 
Scratching my head Comments: Hi there!!! I have a 1995 Mercedes benz s600 european version and everything is wonderful inside and out it appears the previous owner took care of it However there is one caveat: acceleration. The engine runs as it should on idle and behaves well once it is placed in gear- but that's where pleasantries end. I give it some gas and the acceleration is either very sheepish, or doesn't respond in the manner of how much throttle i give it.... not until I let up on the gas and hit it again a few times, will it accelerate as it should. even then it'll still hesitate somewhat. NO warning lights are present on the dashboard readout, but i'm suspecting a snafu in the throttle body or maybe acceleration pedal sensor, but i'm not completely sure.. Once again, no Conflicts out on dash- I also remember there was no readout on the OBD reader either
December 11, 2014
  Followup from the Pelican Staff: This could be a few things. Possible fuel delivery issue or broken breather hose. Start by inspecting the intake air ducts and crankcase breather lines. - Nick at Pelican Parts  
itsmikey Comments: Nick thank you. Spoke with Michael today he was great. He sent me a diagram to show my mechanic to make sure its the right piece. then I will order it.

its a U shaped tube for the air-pump. I really appreciate all your help.
June 9, 2014
  Followup from the Pelican Staff: Awesome, glad to hear. Thanks again. - Nick at Pelican Parts  
itsmikey Comments: Here's the photo the airpump and filter are on the left. I know there has to be a cap or tube here. I can stick my finger down this and this top has a grove for a hose. thanks for looking
June 8, 2014
  Followup from the Pelican Staff: COuld be a missing small duct or filter. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
itsmikey Comments: The car is in the body shop I will send a pic next week. If you can figure this one out. I will order the part with express shipping thanks Mike
June 5, 2014
  Followup from the Pelican Staff: Thanks for the follow up, keep me posted. - Nick at Pelican Parts  
itsmikey Comments: Please help, my 1995 E320 cab has hot air blowing up from the engine by air filter and pump. I see a connector on the engine but no hose. I cannot find anything to figure this out. Or was it capped at one time. Mechanic says it fine but its an open connector to the engine and it blows hot up and the hood and air filter get really hot. Any Ideas what this is.
June 3, 2014
  Followup from the Pelican Staff: Can you share a photo of the component? - Nick at Pelican Parts  
bob Comments: I need information about the location of the fuel filter on two different Mercedes:

1. 1998 SL500
2. 2008 e350 4matic

Where are the fuel filter located on these cars?
thanx
April 27, 2014
  Followup from the Pelican Staff: 1998 SL500 - in front of right rear tire.

2008 e350 4matic - in the fuel tank.

Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.


- Nick at Pelican Parts
 
jon Comments: My 97 E320 will start and run at first with a lope at idle then smooth right out after about a min. Its idles perfect no miss at all, but when I step on the gas pedal it bogs and back fires. It wont get past 2500 rpm. I let off the gas and it returns to a lope and then runs perfect at idle. Ive replaced the cam sens, crank sens, ox sens, cad converter. But no change. I unplug the MAF while running and get no change it runs the same. could this be the problem? Thanks Jon
April 14, 2014
  Followup from the Pelican Staff: SOunds like engine timing is off. - Nick at Pelican Parts  
ozzy Comments: For Frustrated above; You have a dry joint on your starter motor bendix coil.As soon as the engine gets hot the wire pulls away, breaking contact.On cooling wire re makes contact.
March 17, 2014
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
 
mensah Comments: My 2000 mb s500 started leaking fuel from de canister, so thought of changing it n still same problem. Try to block de leakage n wat i had waz a great noise 4rm my engine to my surprise der is a crack on de engine side, de engine now make noise like der is no siliencer fix. Pls wat is de problem
December 26, 2013
  Followup from the Pelican Staff: A crack on the engine side of what? The fuel rail? I would replace whatever is cracked and leaking. - Nick at Pelican Parts  
friday567 Comments: On the 1997 E420 W210 the MAF mass air flow sensor housing PVC is NOT located in line from the air intake to the engine cover. It is actually located under the engine cover. It is attached to the throttle body via hose clamp. No tools needed. GENTLEY pull off the MAF housing from the throttle body. Be VERY careful removing the small sensor opposite of the mass air flow sensor as heat has made this brittle and easy to break. Once the housing is removed the actual mass air flow sensor will require a torq screw driver to remove two screws. This is the $250 - $500 part so be carful.
September 3, 2013
  Followup from the Pelican Staff: Thanks for advising out readers - Kerry at Pelican Parts  
Sil Comments: Is there any Re-Learn needed for the MAF after installation?
September 2, 2013
  Followup from the Pelican Staff: Other than clearing the adaptations, there is no relearn. You will have to reset the adaptations using a Mercedes scan tool. - Nick at Pelican Parts  
Angie Comments: About 3 weeks ago my CEL came on 1999 sl 500 MB. I replaced the MAF sensor and the light went out the car was driving smooth for the past 2 weeks. I reached 80 mph on freeway this morning and the light came on, and the car was chocking and running rough. Why?
July 31, 2013
  Followup from the Pelican Staff: Sorry.
Diagnostic scan codes are required for any answer to your question.
- whunter
 
Frustrated Comments: My 94, S500 Mercedes is nothing but a fine car in every respect, but over the last couple of months I have had a problem that no one seems to understand. I can start the car from cold and drive as smooth as a RR for either 100 miles or 100 yards. Once I turn off the ignition, it won't start again for maybe half an hour, when it will run as smooth as ever. I have changed the crank and cam sensors, and replaced the fuel pump relay, checking all of the fuses. I took it to a local Mercedes man, who put it on the computer, saying that this car is amazing, there are NO codes at all and it seems to be in good order. Then I went to start it and it wouldn't start. I eventually started, but he couldn't find what it was. I know that this is a common problem with the 140 series, but it's totally frustrating to have an great car and can't start it.
May 12, 2013
  Followup from the Pelican Staff: My best guess would be one of the biodegradable engine wire harnesses failing. - whunter  
Allan Comments: Also, if my 98 SL500 gas gauge always shows extremely low and the yellow lite is on, any easy fix or idea's??

Thanks
Allan
October 29, 2012
  Followup from the Pelican Staff: Hello Allen

FYI:
The fuel level sender has been superseded five times, (I suspect failure issues).

I suggest you replace it with the newest level part.

Fuel level sender
MB# 1295421117

Here is a link to the best DIY.
http://www.benzworld.org/forums/r129-sl-class/1596936-diy-r-r-fuel-tank-sending.html

roy@pelicanparts.com

- whunter
 
Allan Comments: Thank you very much your your help. It ended up that because this car sat for 2 years and the gas gauge stopped working, I would reset the odometer and calculate that I got 350 Miles per tank......I ended up screwing up this method of monitoring how much gas I had and for 2 months I would "top off" and the car would barly take any gas. Ended up I had lost count on the odometer and had a full tank the entire 2 months of doing this....signed..DUMMY In Maryland. I do have another question. I overheated my 85 380SL and fried the engine....I have a complete changeover with 49K in a 75 450SL. Is it feasible to swap or wait for a 380 to come in???
October 29, 2012
  Followup from the Pelican Staff: It is possible, some of the late model used the same tank and sensor.
You would need to remove the 1975 unit to verify.

The part number is:
Fuel level sender
MB# 1075420804

roy@pelicanparts.com

- whunter
 
Allan Comments: I need help regarding 1998 SL500 that stops pumping gas into tank while putting in gas at station after 2-3 gallons, after that it takes forever to continue as the gas pump shuts off every second. I was told probably gas evaporator valve in right quarter by gas tank? need help confirming please
September 19, 2012
  Followup from the Pelican Staff: If the charcoal fuel vapor purge canister has been filled with liquid fuel, it is usually ruined..
This is typically caused by over filling.
All "modern" Mercedes have a "Do Not Top Off" warning because of the problem you describe.

It only requires one fill up; squeezing in every possible drop to:
* Force excess fuel into the fuel vapor lines and charcoal purge canister.
* Damage the evaporative emission system valves, possibly the fuel vapor vent valve, not allowing pressure relief.

Note:
If your charcoal fuel vapor purge canister is shaped like a "roughly" 2.5 inch wide X 12 inch long black plastic cylinder, it has been superseded in the Mercedes electronic parts catalog "THREE times" (possible technical issues).

roy@pelicanparts.com

- whunter
 

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Wed 12/7/2016 02:12:29 AM