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Gary, Australia Car Mechanic
Category: Mercedes
Satisfied Customers: 1185
Experience:  Senior Technician
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There appears to be oil in harness from Camshaft sensor on

Customer Question

There appears to be oil in harness from Camshaft sensor on my C180 compressor coupe
The harness has been replaced but the check engine light has returned after cleaning on 2 occasions. The mechanic suggests that oil has leaked into the computer and is causing a short. The car performs perfectly otherwise.
David Morcom.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Gary replied 1 year ago.

Hi David,

If there is oil at the computer end of the harness, then it could well be an issue.

But, if it is only at the sensor end, I would replace the sensor, ensure the harness is clean, and monitor the cars performance.


Customer: replied 1 year ago.
As oil does not conduct electricity I can't understand why the mechanic would suggest a short is causing the engine warning light to appear. If we do replace the cam sensor will that resolve the leak? I also understand that Mercedes had a recall for 2003 and 2004 C230K owners for exactly this problem. I also understand that the part numbers are exactly the same for my 2003 C180.
Expert:  Gary replied 1 year ago.

Hi David,

I would do as I have mentioned above.

Oil is a conductor as far as sensor voltages are concerned.

Especially if he feels the oil is at the computer end.

Seen this many times on many different cars.

Clean the connectors with electrical contact cleaner, and replace the sensor.


Customer: replied 1 year ago.
Thanks I will do as you suggest
Expert:  Gary replied 1 year ago.

Hi David,

I hope this is a relatively easy economical repair for you.

Merry Christmas to you and your family.