Quote:
Originally Posted by X5chemist
Check the DISA valve seal. What are your fuel trims? What are the O2 sensors reading? Readings there will tell you if unmetered air is getting into the combustion chamber.
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In my case, a sticky IAC valve was causing these O2 sensor errors and codes. I had no other symptoms; smooth idle, no hesistations.
Removed it and cleaned it with MAF cleaner, no more codes. But getting that thing back in... well at least all the cuts have healed now.
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2001 E53 M54 5MT Oxford green over crusty black leather 206,000mi
2002 E46 M54 2.5 5MT silver over black sensatec 217,000mi