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Hi All
Anyone with an NC had this problem, I am running goodwin headers with standard midpipe and muffler, relocated the O2 sensor further down the midpipe per the mod instructions, while the car is running no CEL but once I turn it off and restart it CEL comes back on and I have to reset again, first start after the reset all is fine but let it cool down and restart and the light is back on, any suggestions?

you'll need an OBD2 reader to find the code, we will be able to help then

Could be one of a thousand things

Thanks Reggie
Thought that maybe it was a common problem, looks like I will have get a reader.

if the O2 sensor extensions are touching the exhaust they will short. It may throw a code, but the car won't start as it will keep blowing the IGN fuse.

Depending on the year of the NC it could be a thermostat code its throwing.

Did you relocate both O2 sensors, to either side of cat? Or can you get away with just relocating one and removing the other?

Just relocate the lower sensor further down the midpipe past the secondary cat.

Ahh ok, I thought you had to relocate both, one pre and one post to measure the differences between the two. Glad I went with the midpipe with preinstalled O2 bungs!