E46Fanatics - View Single Post - Service Engine light wont go away - Bank 1 & 2 too lean?
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Old 12-14-2011, 01:41 PM   #8
Registered User
Join Date: Jul 2009
Location: Mahopac, NY
Posts: 26
My Ride: 03' 330i
Found a leak in intake boot

I followed the suggestion about tracking down a vacuum leak and BINGO!! Both of the boots on either side of MAF sensor were dry rotted on the back sides out of sight. The rear one has a branch off to the idle control valve, that one had a huge hole in it that I could fit my index finger in. Getting that one off looks like a bitch, it has a hose clamp holding it on which is buried under the throttle body. Is there a DIY on this??
Thanks for the tips!!
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