1999 Toyota 4Runner Check Engine Light

Tiny
ART MUNOZ
  • MEMBER
  • 1999 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
The Check Engine Light stays on continuosly. The DTC is P0171 System to Lean Bank # 1. What would be the cause of this?
Monday, January 28th, 2008 AT 2:54 PM

1 Reply

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
A vacuum leak, dirty mass air flow sensor or bad o2 sensor.
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Monday, January 28th, 2008 AT 3:00 PM

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