Quote:
Originally Posted by maupineda
Do you have the stock cats in the section 1? Did you relocate the post cat o2 sensors after the cats in the section one after header install?
Those codes mean your cats are not working fine. I have them, but my cats are aftermarket and not as effective as OE.
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I'm not sure, I'll have to get under the car and take a look. This is a "new to me" car, so I'm still exploring the car. Do the stock cats have BMW markings on them or anything else to validate that they're OEM vs high-flow?