• Tiny
  • rudy9042
  • 2004 BMW 330ci
  • 6 CYL
  • FWD
  • automatic
  • 100,000 miles

I have a 2004 BMW 330i car with 2 trouble codes: P0171 & P0172 = Bank 1 & 2 too lean.
What does this mean? How would it be repaired?
I thought it might be related to spark plugs because of a slight rough idle so I did an oil/filter change and replaced the spark plugs but rough idle still continues.

Sunday, December 26th, 2010 AT 12:23 AM

1 Answer

  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,716 posts

Inspect the intake boot from the air mass sensor to the throttle body, the boot often gets old and it can have tears in it, go to Realoem. Com and look for part number 13541438759

Was this
Monday, January 10th, 2011 AT 10:37 PM

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