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My "Service Engine Soon" light is on.

Tiny
BELLA OXMYX
  • MEMBER
  • 2003 BMW 530I
  • 165,000 MILES
The OBDII code is P0174 - System too lean. What could this be? How do I fix it?
Saturday, October 8th, 2011 AT 8:03 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 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.
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Saturday, October 8th, 2011 AT 10:48 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Or an intake boot that has a rip in it.
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Monday, October 10th, 2011 AT 2:36 AM

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