I drive a 03 OZ rally. I purchased and installed a Greddy ti-C cat back approximately 4 months ago. About a month ago my CEL came on. I figured it was a bad o2 sensor and it was. However my mechanic told me that the code was for the o2 sensor and that was what was turning the CEL on but there was nothing actually wrong with the sensor it's self. He thinks it is the back pressure of the catback now that it has been covered in carbon. He said i could replace the o2 sensors to fix the problem so i could pass inspection but more likely then not the CEL problem would just come back. Has anyone encountered this problem before or know a way to fix this permanently with out replacing my cat back?

 

bump

 

https://www.evolutionm.net/forums/ev...cel-light.html
That might help solve your problem

 

thanks man ill give that a try

 

I used the above method for my Buschur 3" TBE when my CEL kept coming on. Works great.