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2001 Toyota Corolla engine light on

Tiny
MINHDO64
  • MEMBER
  • 2001 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
My car got check engine light on. DTC P0171. I had replaced front oxygen sensor. After repair, I just pull out negative battery cable and after I ran 10 miles the check engine light on again. My question that I need to use OBD clear DTC or another part still defect that I haven't find out. Please help me to answer
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Sunday, August 30th, 2009 AT 8:57 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0171

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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Sunday, August 30th, 2009 AT 9:10 PM
Tiny
MINHDO64
  • MEMBER
  • 2 POSTS
My car have another problem, when I push pedal, my car look like lost power
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Monday, August 31st, 2009 AT 8:18 AM

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