Quote:
Originally Posted by FlukeSS
If I am not mistaken, when installing headers on these cars, this borks the O2 sensors, and I think normally they get tuned out. Its one of those perma codes that happens with header installs, my tuner tuned out the code while tuning the engine for headers at the same time, if I remember right.
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Maybe the rear O2's but you definitely need the front O2's as they contribute to the AF ratios. There may be tuning required after a header install though.