Check engine light 1999 Malibu

1999 CHEVROLET MALIBU
Avatar
ELANG527
  • MEMBER
  • 1 POST
My check engine light came on and the code that came up on the scanner is p0171 system to lean. Can this be an o2 sensor or a bad fuel filter. I just changed the fuel filter a month ago but he same problem happened 2 yrs ago and I changed the fuel filter and that fixed the problem.
Nov 5, 2006 at 7:21 AM
Avatar
BUELLXB9RFB
  • MEMBER
  • 50 POSTS
Causes
A code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.
Nov 6, 2006 at 1:57 PM
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