I bought my car about 2 weeks ago and I bought it with the SES light on. The codes I am getting are P0135, P0155, P1133, P1153. The codes are for O2 sensor heaters (both banks) and insufficent switching (both banks).

The car has an ls1 hot cam kit, and it has not been dyno tuned. Am I looking at a tuning issue, or should I just replace the O2 sensors?

 

Does the car have headers? Any leaks around the header flange or at the collectors?

 

Does it have cats?

 

The Y pipe is leaking in a few places, and it doesnt have cats.

 

Any leaks near the o2 sensors will cause lazy o2 switching and o2 not heated codes. Get them to seal. Does the car have o2 simulators or have the o2 been tuned out through the computer?

 

Im pretty sure that the rear O2s are deleted from the computer because they are non existant.