Codes, p0171,p0174,p1153 CEL

2003 TOYOTA RAV4
224,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
Avatar
BLUSKY310
  • MEMBER
  • 1 POST
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?
Oct 29, 2017 at 1:13 PM
Advertisement
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 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.
Oct 30, 2017 at 1:04 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle