The SES light came on today. 2003 G35. The OBDII at Autozone indicated that all 4 O2 sensors were bad. The tech said it was probably the computer (ECU?) as it was unlikely all 4 O2 sensors failed at once. He allowed me to reset the codes (apparently they are not allowed to do it) and all was good for about 5 miles. SES light is back on. Thoughts? I really would like to avoid another expensive repair ($1500 last month when cooling fan launched itself through the radiator).

It runs fine but I will have to resolve prior to next mandatory emissions testing. Oh, and the light is constant, not blinking which I understand means serious probs.

Any help would be appreciated. Thanks.

 

damn.. all 4 on at once? seems very unlikely.. hopefully not the ECU... sht that be expensive
best of luck bro. sucks to go through this.

 

No idea but sub'd for the answer.

 

They could all be shot, but could be an underlying cause...ie peice of road debris bounced up and sliced harness?

Time to go under car and poke around and do some diagnostic work