check engine light is on and has custom exhaust, can that be it?
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1998 Ford Mustang Question: o2 sensor
Answer #1sinautoscan.com October 25, 2009, 18:35Master
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 #2Visitor, April 06, 2010, 12:07
I had the same promble (check engine light). I stop using cheap gas and after 3 tanks of gas (plus), the light went out.