I am more of a lurker around here, but Iam here reading the fourms everyday and find these fourms very helpful, I now vow to try to chime in more.That being said ,HELP!!!!!!!!!!!! ,lol .Ok I have been modding the g now since day one about 6 weeks ago I installed my test pipes ,the problem is MY SEL.I didn't start worrying about it till this week I got the 350 z fix with the non-fouler tubes and reset my ecu the cels pop right up soon as i start the car up ,hello SEL ,so did i destroy my 02 sensors by having them in the test-pipes ? or are there more to it?

 

You should find out the actual code to troubleshoot. If you're an 04.5 you have wideband o2 sensors. If you're an 04 you have narrowband o2 sensors. The widebands are harder to fool than the narrowbands.