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Old 05-12-2010, 07:18 PM   #25
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Join Date: May 2010
Location: Dallas, TX
Posts: 2
My Ride: 2003 325i
These codes seem to indicate a lean mixture. I would check for any vacuum leaks, or other air intake leaks. Start looking for things you may have caused in the areas where you were working (broken crankcase vent valve hoses, etc.), but also check common vacuum leaks like the intake air boot. These codes may not be related to the o2 sensor mod as the rear o2 sensors have no effect on fuel mixtures. Just my 2 cents.
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