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Just bought a 2012 with kooks headers and a corsa exhaust. Check engine light comes on after 2 or 3 days every time I reset it. Dealer says it's the exhaust system. any way to fix this? Thanks for any help.
you can get a ODBII code reader and it will tell you for sure which code is being throw ( many auto parts stores will tell you the exact code for free )
but with that said, being you have headers, I agree it is likely related to your O2 sensors ( or lack of ) that is triggering it. You can tune that code away.
a 15$ dongle and a smart phone will allow you to pull the codes. Search the app store for "OBD" and find an app that calls for an ELM327 dongle, Then grab a dongle from the big river.
You need to first make sure the car was tuned after they installed the headers. The longtube headers relocate the o2 sensors a lot further downstream and the car needs to be tuned to achieve a correct air fuel ratio. Even if the car has high flow cats it will still throw a code, a tuner can simply disable the rear o2's. Either way make sure the car has a custom tune on it for the headers or it will never run to its full potential.