o2 sensor on 1998 Ford Mustang

check engine light is on and has custom exhaust, can that be it?

by in Rolla, MO on October 25, 2009
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2 answers
ANSWER by , October 25, 2009
It could be the CAT if it was removed i would get a diagnostic to see what the problem is autozne does this for free.
ANSWER by , April 06, 2010
I had the same promble (check engine light). I stop using cheap gas and after 3 tanks of gas (plus), the light went out.