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Pre-Cat Fuel Trim Lean AND Rich?! Pre-Cat Fuel Trim Lean AND Rich?!
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Old 05-15-2012, 09:19 PM
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Wow you did a lot. Well I can't really think what else it can be. Maybe check if you bulbs are ok. Lol. How is the thermostat on your car. Mine has a sensor on it that gave me an error saying it got stuck open. It actually told me thermostat temp is below coolant temp. Replaced it and all good.

As far as your situation, I think it's some sensor screwing you. Let's back up. That maf you swapped, is it OE BMW?
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