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Today my check engine light came on in my 02 mustang gt, its been running perfectly, oil pressure is fine, so I have no idea what's causing it. I recently installed a bassani catted x pipe; would that make it come on? I'm still going to have it checked with a mechanic anyway, just wanted some input.
 

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My guess is to go to autozone and get the codes read. Then post the codes here and we could tell u what they are and possible causes and yes maybe ur exhaust mod affected the o2 or set off an o2 code nothing to worry about when u reset the ecu. Atleast thats what i would do is reset the ecu to relearn with the bew exhaust
 
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