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Replacing Porsche 911 Carrera Engine Sensors
 
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Pelican Technical Article:

Replacing Porsche 911 Carrera Engine Sensors

Time:

1 hour1 hr

Tab:

$300 to $900

Talent:

***

Tools:

Wrenches,

Applicable Models:

Porsche 996 Carrera models (1999-05)
Porsche 997 Carrera models (2005-08)

Parts Required:

Engine sensors

Hot Tip:

Check the codes first prior to replacing sensors

Performance Gain:

Optimal running engine

Complementary Modification:

Replace oxygen sensors
I've split this article up into various photos of the sensors and their locations on the engines so that you can easily find them when you need to replace them. 
The ambient air temperature sensor measures the air temperature in the engine compartment.
Figure 1

The ambient air temperature sensor measures the air temperature in the engine compartment. This tells the DME computer how hot it is inside the engine compartment, so that the engine compartment fan can be turned on or off. This sensor is simply held in place by a rubber grommet that is attached to the intake manifold on the left side of the engine near the air-oil separator.

The coolant temperature sensor is located on the pulley side of the engine off to the right side of the car near the cylinder head.
Figure 2

The coolant temperature sensor is located on the pulley side of the engine off to the right side of the car near the cylinder head. This sensor measures the temperature of the coolant and is used to adjust mixture levels as the engine begins to heat up to optimum operating temperature.

The oil level sensor/oil temperature sensor is shown by the blue arrow.
Figure 3

The oil level sensor/oil temperature sensor is shown by the blue arrow. This is a somewhat unique sensor in that it contains both level and temperature sensing functions within a single unit. Beginning in 2006 Porsche moved the Air Oil Seperator to this location and moved the oil level/temperature sensor to the left side between the starter motor and air pump. The knock sensors (purple arrow) have remained in the same locations. There is one installed on both the left and right side of the engine block. Located under the intake manifold, both of these sensors are relatively difficult to get to (you need to remove the intake tubes to access themâÂ"see Pelican Technical Article: Porsche 911 Carrera Starter Replacement ).

This photo shows the group of sensors located on the left front of the engine.
Figure 4

This photo shows the group of sensors located on the left front of the engine. The purple arrow shows the crank angle sensor, or flywheel sensor, which reads the toothed flywheel as it rotates past the sensor (harness plug shown by yellow arrow). The orange arrow shows the camshaft timing advance solenoid (red arrow is the connector). You can access the sensor/solenoid from underneath the car and the electrical connections from the engine compartment.

Shown here is the camshaft position sensor.
Figure 5

Shown here is the camshaft position sensor. There is one located on the top of the right cylinder head toward the rear and one on the left cylinder head toward the front for the five-chain motors used up to about 2001. For 2002 and later three-chain motors, the sensor is located on the top of the right cylinder head toward the front and on the left cylinder head toward the rear (insert photo, blue arrow).

This photo shows the oil pressure sender/switch.
Figure 6

This photo shows the oil pressure sender/switch. Located on the left-side cylinder head, this sender is a combination unit that senses pressure and also includes a low-pressure switch as well. Grab the sender by the base using a wrenchâÂ"don't grab it by the canister, otherwise you may damage the unit and cause it to leak. Use new sealing rings to guard against oil leaks.

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Comments and Suggestions:
Jimmy. Comments: My 2000 996 c4 has broken down on me 3 times now. Twice when the car was at a junction and once whilst doing 60mph. I've since changed the batterie and alternator but it is still doing it. Could this be some sensor fault?
Thanks
November 30, 2016
Vin Comments: I have a 2003 911 Carrera 4 996. My oil pressure gauge drops to zero every once in a while with a no oil pressure alarm.
I put vehicle in neutral and give it a couple of revs. the gauge returns to normal.No Error codes. This is happening more often as the year progresses. What could it be? Sensor or oil pump? Thanks Vin
September 20, 2016
  Followup from the Pelican Staff: Most likely the sensor. Only way to know is to check pressure when the problem is present. - Nick at Pelican Parts  
Mike Comments: BTW the #2 knock sensor is on a 1999 C2 996 cabrio
September 8, 2016
  Followup from the Pelican Staff: Thanks, got it. - Nick at Pelican Parts  
Mike Comments: I am replacing a #2 knock sensor. Where is this located. I have the part from Pelican Parts.
September 8, 2016
  Followup from the Pelican Staff: That is the sensor on the right side, behind the a/c compressor. - Nick at Pelican Parts  
Bobbybeans Comments: Hi, I have a 2005 997. I noticed the engine compartment fan cut in, and stayed on for my drive home from work. I drove again the following day to see if the problem was still there, the fan was off but cut in once up to temperature, and cut out again ... Once again I took the car out that evening and noticed my oil temperature was not at its normal rock steady 90deg, but fluctuated between 92 100 deg.
before this I was thinking its a sensor or relay issue, now not so sure, any thoughts?
July 11, 2016
  Followup from the Pelican Staff: Hard to say without temp info from when fan came on. I would assume it was working normally. I would check vehicle thermostat and temp operation to be safe. - Nick at Pelican Parts  
Mo Comments: Hello, I have a 2007 911 Turbo and I'm trying to order an engine compartment temperature sensor but I can't seem to find it. Can you please provide the part number?
February 2, 2016
  Followup from the Pelican Staff: 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
 
Navidad Comments: driving my 2000 996, temp 90C, but temp light flashes, cannot hear the radiator fans. Car starts and drives normally, fuses okay, rad level okay but after reaching operating temp 90C, light flashing....could both front rad relays both faulty?
June 24, 2015
  Followup from the Pelican Staff: Check the coolant level. If the coolant level is OK the engine compartment purge fan or engine compartment temp sensor could have a problem. - Casey at Pelican Parts  
Navidad Comments: lost the Seating grommet for the engine ambient air temp sensor
996 606 113 00 or WO133-1914608 which the sensor fits into. The grommet fits into a groove near air oil separator...2000 , 911 Carrera
Is there a stock # for this item, thanks
May 14, 2015
  Followup from the Pelican Staff: 993-110-530-01-OEM - Casey at Pelican Parts  
JohnnyboyT50 Comments: My 997 C2 has just had an engine rebuild and is showing signes of overfueling on both sides. There are no errors recorded and the MAS has been changed with no affect. Is it possible to check the Coolant Heat Senor or is it just better to replace it as the engine behaviour suggest that the ECU thinks the engine is cold.
May 11, 2015
  Followup from the Pelican Staff: The instrument cluster should show you the temperature as recorded by the coolant temperature sensor. Is it somewhere in the 180 F range when warmed up?? What signs are you seeing? That sensor when bad usually sets a fault and causes a no start when warmed up, and trying to restart. - Casey at Pelican Parts  
Joelnismo Comments: Hi Nick the cause of intermix was the oil cooler.
April 4, 2015
  Followup from the Pelican Staff: There's a chance the oil pump may have been damaged. That would be best case scenario. - Nick at Pelican Parts  
Joelnismo Comments: I have a 996 99' with oil and coolant mixed. I cleaned all hoses and radiators but when you turned on the car the preassure gauge goes up to 5 but when the car is hot the preassure went down below 1 and the oil light turned on. This is my question, it is possible that some engine components still have remainings of the chocolate milk?
March 30, 2015
  Followup from the Pelican Staff: Sounds like you have damaged bearings or oil pump. What caused the intermix? - Nick at Pelican Parts  
avi Comments: having a problem with 2002 porsche 996. there is no response for throttle even when the accelerator pedal is floored. checked fault codes found fault logged for DVE Fault.when inputs are observed the value changes for accelerator pedal sensor but throttle vale remains closed. fault codes are 'P1502 DVE fault during spring test', 'P1504 DVE fault necessary intake air position. swapped the sespected throttle body to a good car found working fine, but not working in problematic vehicle. pls advise
February 1, 2015
  Followup from the Pelican Staff: MOnitor throttle angle verse desired using a Porsche scan tool. It could be a wiring issue. - Nick at Pelican Parts  
howard Comments: i have a 2006 porsche 911 3.6 liter c4 i recently changed the left radiator. while testing for leaks the engine temp guage stopped registering but it keeps flashing in the red zone. I have 2 questions the first is since i am trying to replenish all the coolant will the radiators open up when the engine gets hot so i can fill the system or will they remain closed endangering my engine through overheat. secondly how har is it to test/replace the temp guage sensor//
November 16, 2014
  Followup from the Pelican Staff: Fill the system cold until all air bubbles are gone. Then idle the engine and add coolant to top it up as needed. - Nick at Pelican Parts  
CEA911 Comments: Do I need to drop the engine in order to access the top cam position sensor. The image does not clearly guide me to the location.
August 22, 2014
  Followup from the Pelican Staff: No, depending on the bank, the right side sensor can be replaced by removing some components, it is on top of the cylinder in the front corner. The left side sensor requires more disassembling, the intake manifold cross-over pipes have to be removed and the crankcase breather.
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
 
paul Comments: I have a2007 911 turbo wondering what the easiest way to change the temperature sensor on the top of the engine. I can see it but find it hard to get to

thank
Paul
June 5, 2014
  Followup from the Pelican Staff: A deep socket a long extension should do. If not available, try breaking it free with a stubby wrench, then unscrewing by hand.- Nick at Pelican Parts  
lou Comments: fyi on a 996 turbo the level sensor is bolted on the oil resevoir
March 25, 2014
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
Steven Comments: I would like to purchase the Camshaft Position Sensor for my 2004 Turbo S 996. My vin-number is 682090 for last six digits. Please let me know which parts to purchase and your availability.

Thank you.
December 9, 2013
  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
 

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