2005 Toyota Corolla check engine light is on

Tiny
MRRONALD
  • MEMBER
  • 2005 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 77,000 MILES
Scan code is P0171 - system too lean. What does that mean? Do I need to replace the O2 sensor, or is it something else?
Do you
have the same problem?
Yes
No
Thursday, January 14th, 2010 AT 9:38 AM

1 Reply

Tiny
MMPRINCE4000
  • EXPERT
The upstream O2 sensor is reading a lean fuel mixture, this could be an O2 sensor, clogged injector, low fuel pressure.

I would replace the O2 sensor, erase code. If code reappears, then measure fuel pressure with mechanical gauge to start.

I would also add a can of SeaFoam after changing O2 sensor to gas tank.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, January 15th, 2010 AT 10:06 AM

Please login or register to post a reply.

Related Check Engine Light Content

Is it Safe to Drive Check Engine Light
VIDEO
Is it Safe to Drive Check Engine Light
Instructual repair video
VIEW MORE

Recommended Guides