hey guys,

So I put my stock cats back on my Z, I had test pipes on the car and was running with a SES light for a while. I went to my mechanic and he put the stock cats back on but when I started the car the SES light was still on. He then said he could take the code off, so when he was deleting the code I saw that it said (bad o2 sensor). Think the code was PA400? I did not see it clearly. After he deleted the code the SES light was gone, but after about 50 miles it came back on. I dont know if he damaged my O2 sensors or if I have to wait a while before the light goes off again? Anyways I heard that it might be because of a exhaust leak? My Y pipe-my exhaust barely leaks little drops of water. Do you guys think he messed up my O2 sensors?

Any help would be appreciated. Thanks

 

Okay I believe the code was PA020? I dont really remember..

 

sounds like you have a broken o2 sensors. did your test pipes have extended o2 bung? most test pipes have shorter o2 bung and it throws a check engine light. i used berk test pipes and no problem.

 

go to an auto parts store.. auto zone, o'reilly, etc.. and have them scan it and tell you the exact code. then go from there.

 

Alright yeah I will go to o'reilys and see which code it was. Will they check free of charge? But I had 1 O2 sensor bung for my left test pipe. It still threw the SES, and now with my stock cats the light its still there. I think it may be a broken O2 sensor too since my mechanic seemed a little sketchy when he took it off.

 

I went to my local o reiley's and they do not scan codes anymore in California.... Some b.s. Now I have to wait to go to my mechanic, probably will just buy the code scanner and just keep erasing the ses light? I dont know now, it is becoming a pita seeing it everyday.

 

Lmao...
You are shooting in the dark until you get the code read.
You may have a bad cat or o2 sensor or exhaust leak or wire harness...
You need the code to figure out which bank if throwing the code
Then go from there