I've 2003 C230 Komp with 1.8L engine.
My mechanic is trying to change O2 sensor(pre-catalytic). The part would cost $ 238.
I've purchase the part from local NAPA store for $ 144.
When I've gave the part to the mechanic, he told me it's a wrong part.
I've purchase 15cm with 4 wire connection from Bosch.
Is the correct part longer than 15cm and has different connection than 4 wires?(According to my mechanic it has different measurement).
I've called the local mercedes dealer and they want $ 305 for the part.
Has anybody change this part at home. Does anybody has exact part number or pictures on how to change it?
I can see the end of O2 sensor but I can not see where the end of the wires connect to.
If anybody has any acurate measurement of the length and connection info, I would really appreciate it.

 

I've call the local dealer and they've quoted me with part number:0035427318.
I've found a dealer called Europartsamerica who had same part number.
Other parts dealer had different parts number which was BSH 16272.
Looks like the terminal end are different. BSH 16272 appears to be round and the part I've order appeared to be rectangular.
I'll bring the part to the mechanic and hopefully this part will fit my vehicle.