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2005 Toyota Corolla code P0171

Tiny
MOCKARANA
  • MEMBER
  • 2005 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
While driving car died and check engine light came on and then would not start. The check engine light had come on and off during the pryor week. I checked the code and it was p0171 for fuel to lean on bank 1. What should I check?
Thursday, February 26th, 2009 AT 5:35 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Thursday, February 26th, 2009 AT 6:20 PM

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