2000 Toyota Corolla P0171

CARLOVER

MEMBER
2000 TOYOTA COROLLA
4 CYL
FWD
AUTOMATIC
92,000 MILES

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?

Friday, September 19th, 2008 AT 12:36 AM

1 Reply

KHLOW2008

MECHANIC
41,815 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.

SELF-DIAGNOSTICS -2000 Toyota Corolla LE 9/28/2008