My "Service Engine Soon" light is on.

2003 BMW 530I
165,000 MILES
Avatar
BELLA OXMYX
  • MEMBER
  • 1 POST
The OBDII code is P0174 - System too lean. What could this be? How do I fix it?
Oct 8, 2011 at 8:03 PM
Advertisement
Avatar
HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
this can be from low fuel pressure, a bad injector or a vacuum leak. check for a hose off that is soft or have your fuel pressure checked. it may below. your fuel pressure must be 50psi, nothing lower.
Oct 8, 2011 at 10:48 PM
Avatar
DOCHAGERTY
  • CAR REPAIR CONTRIBUTOR
  • 9,606 POSTS
Or an intake boot that has a rip in it.
Oct 10, 2011 at 2:36 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.