I recently attempted to get my 2005 crossfire state inspected. I was told that the O2 sensor was not responding to the OBD. What are possible causes and how can I repair this issue?

 

It would seem to me you would have a "CHECK ENGINE" light and a diagnostic code if an O2 sensor was bad.

My car has been throwing O2 sensor codes for about six weeks, my codes show that the upstream or front left (and at times, right) sensors are bad. These are easy to change and cost around $100 each. Im not sure WHERE the downstream sensors are.

My standard advice to someone is: Fix it yourself or take the car to some local shop known for expertise with Mercedes products. Avoid most Chrysler dealers.

 

Has anyone noticed diminishing performance in older 02 sensors? I recently replaced my CPS and the car runs like the dickins now. It never misfired before or seemed to run poorly, but now, in the higher gears, the car pulls much harder.

I am tempted to do a sensor refresh on the car. MAF sensor has been cleaned and installed in the larger TB and MAF housing. The CPS was replaced with one with a lifetime warranty from Advanced Auto. ($45) I was thinking about doing the Camshaft Position Sensor ($100) and the O2 Sensors to see if there is more umph somewhere to be found in sensors that are not 10 years old.

Any suggestions, Anyone have the same experience, Anyone have recommendations for02 sensors that I shouldn't use. I know Camshaft PS should be bosch but I'll go with the one that has a life time warranty. Looks so easy to change out.

Thanks in advance for your replies.

 

I can change the sensors my self, no problem. I'm thinking I have the origional sensors and 136K miles. I was hoping that changing the sensors would improve gas mileage and fueling.