Hopefully some of you can help me...I have a 2002 c230 coupe .. I had a check engine light come on a while back.. P0135 bank one sensor os2 sensor and P0132 os2 high voltage.. The dealer replaced this o2 sensor about 1 1/2 years ago and about 25k miles latter.. its failing ?? I did a little research on this form and found that a dirty MAF sensor sometimes cuases these problems also.. so I cleaned it.. when I removed the conector oil I noticed it was full of oil and the inside of the intake was coated in engine oil.. I cleaned everything with Radio Shack electrontic cleaner (non lubricated) I reasembled and cleared the codes.. the cleaning apears to have gotten rid of the P0132 code and the P0135 came back on.. Any thoughts or help would be appreated.. thanks

 

While I can't solve your problem, for what its worth an O2 sensor can go at any time. When I picked up my 2003 BMW the sensor went that day with only 13000 km (8000 mi). I was told these things often go when the climate starts to change. i.e. spring and fall. Other cars I've owned have never had an O2 sensor in their lives.