Quote:
Originally Posted by axis
This is well covered on this site. They are cat efficiency codes from moving the rear O2 sensors further back and not being able to heat up properly. It happens with no cats or high flow cats. Kooks green cats are suppose to not throw the codes but I have no experience with them. They are pricey though. The only other way to not throw the code is to tune the rear O2 sensor out. No ill affect comes from that since the rear set only tells the PCM if the cats are working properly. They have no input on how the car runs.
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kooks green cats work i used them and got no cel. they just are a pricey option...