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2000 Toyota Corolla P0171

Tiny
BKSERVICE
  • MEMBER
  • 2000 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 96,059 MILES
Common fix for code p0171
Tuesday, May 19th, 2009 AT 4:33 PM

3 Replies

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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Tuesday, May 19th, 2009 AT 4:46 PM
Tiny
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Tried every thing you mentioned, is it poss oxygen sensor could be at fault
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Tuesday, May 19th, 2009 AT 5:05 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the 02 sensor check its switching activity

BTW what was the fuel pressure reading?
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Wednesday, May 20th, 2009 AT 12:36 AM

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