2 trouble codes

2004 BMW 330CI
100,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
RUDY9042
  • MEMBER
  • 1 POST
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.
Dec 25, 2010 at 4:23 PM
Advertisement
Avatar
DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 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
Jan 10, 2011 at 2:37 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle