2000 Toyota Corolla P0171

2000 TOYOTA COROLLA
92,000 MILES • 4 CYL • FWD • AUTOMATIC
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CARLOVER
  • MEMBER
  • 1 POST
I got the CHECK ENGINE light on my car and the OBD2 reader shows P0171. I cleaned MAF sensor and erase the code. The car ran fine for 2 weeks and then the CHECK ENGINE light comes back up again.
What can I do for it?
Sep 18, 2008 at 5:36 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,814 POSTS
Hi CarLover,

Circuit Description

Fuel trim refers to feedback compensation value compared against basic injection time. Fuel trim includes short-term and long-term fuel trim.

DTC P0171 is set when fuel trim is driven rich beyond a certain value.
Possible causes are: 
Air induction system malfunction. 
Fuel injector restricted. 
Defective Mass Airflow (MAF) meter. 
Defective Engine Coolant Temperature (ECT) sensor.
Improper fuel pressure. 
Exhaust system leak. 
Air/Fuel (A/F) sensor circuit is open or shorted. 
Defective Air/Fuel (A/F) sensor. 
Vehicle is ran out of fuel. 
Defective ECM.

© 2007 Mitchell Repair Information Co., LLC.
SELF-DIAGNOSTICS -2000 Toyota Corolla LE 9/28/2008
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Sep 27, 2008 at 5:06 AM
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