So I have replaced the oem headers with aftermarket catless headers. I’ve been driving with CEL on and I want to try and fix the misfiring problems. I’ve got 3 misfires on my engine. I only have the o2 sensors that go before the cats on and the ones after the cats are off.
Recently I have:
Swapped spark plugs and ignition coils, also replaced valve cover gasket and injector o-rings and filter baskets.
My first bmw I have owned so just curious if you guys would know or have any leads that I can check. Thanks for your time!
Get a code reader and hook it up. I would think you will run into issues since the post cat o2 sensors are removed.
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