check engine light

[95mustanggt]

Originally posted by Simi Stang
No, you should be able to run aftermarket headers along with the stock O2 sensors just fine. I do. No "jumper wire" required.

You'll need either a jumper wire or a code reader to find out what code is causing the "check engine" light to come on. Since you can make a jumper wire very easily and cheaply it is the best way to to, IMO.