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?
Thursday, January 14th, 2010 AT 9:38 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
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.
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Friday, January 15th, 2010 AT 10:06 AM

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