Codes, P0171, P0174, P1153 CEL

BLUSKY310

MEMBER
2003 TOYOTA RAV4
2.0L
4 CYL
2WD
AUTOMATIC
224,000 MILES

I am having this lean check engine light and cannot diagnose it. Replaced new O2 sensors, MAP sensor, throttle body gasket. STFT stays constant at sixteen to eighteen percent even when the engine is revved determining it is not a vacuum issue. What can it be?

Sunday, October 29th, 2017 AT 8:13 PM

1 Reply

KHLOW2008

MECHANIC
41,814 POSTS

Have the fuel pressure and fuel flow tested.

A weak fuel pump or clogged fuel filter can cause this.

Check the ground circuits around the engine, poor ground connections can affect readings causing the ECM to read wrong and trigger the MIL.

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Monday, October 30th, 2017 AT 8:04 PM