OP
mainbunny
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- Joined
- Oct 19, 2014
- Messages
- 34
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- Location
- UK
- Your Mercedes
- c200 2002 2 litre petrol Kompressor saloon
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- Thread starter
- #21
Thanks buddy..You're replying to yourself now.
It's the after/post cat sensor a four wire and has a heater element that's why the code is, P0141 O2 Sensor Heater Circuit (Bank 1 Sensor 2). This can be caused by a simple failure or as a result of oil wicking into the wiring harness on the M271 engine. Changing it without fixing the oil problem will result in another failure and lots of other odd problems.