Check engine light 1999 Malibu

Tiny
ELANG527
  • MEMBER
  • 1999 CHEVROLET MALIBU
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.
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Sunday, November 5th, 2006 AT 3:21 PM

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Tiny
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.
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Monday, November 6th, 2006 AT 9:57 PM

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