makan911

Hi,
W203 C230K Sport Coupe mod.03 has about 20000 mils in best conditions.
Sparkplugs,Air and fuel filters are new
At first I changed the after cat O2 sensor (OEM).After the test drive(10-15 mils) having the same code P0137 /check engine light.
I changed also to cam sensors (with oil leak) and also installed the cable upgrade recomended from the MB Factory! Many times cleaned the connectors(with contact cleaner) from ECU,cam sensors,Os sensors before/after cat.
Still having the same problem.
Could you help me with any idea or tip?
Thx in advance
makan

Glyn M Ruck

P0137 = O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Did your car have leaking cam sensors? Did oil get into the engine wiring harness?

makan911

yes and I cleaned already many times the connecter from the ECU and O2 sensors. For sure I cleaned also the cam sensor conecters.
regards

guanabara

Glyn asked you about leaking cam sensors because the oil used to leak through the wiring harness all the way down to the bottom where it connects to an engine control module. If the oil got that far down then you could have some fooling of connections, etc. There is a new harness set of wires that prevents oil leak from the cam sensor to migrate through the harness. Most cars were covered by a recall to update the cam sensor wires.

Please let us know if you got the problem resolved in any way
Thanks

makan911

hi,
infact I solved the problem changing the new wire loom to ecu, 2 camsensors and also 2 camsensor connectors
sorry for not updating/sharing before
best regards
makan

Glyn M Ruck

Great - a new engine harness was going to be my next suggestion.

Servellon

Hi i got the same problem!..can you take pictures of the parts you cleaned?!..and changed please!...thank you

makan911

Hi,
could you send me your fault code?