1999 Chevy Truck CODE P0171 AND CODE P0137

1999 CHEVROLET TRUCK
101,000 MILES • V8 • 2WD • AUTOMATIC
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JOACHIM
  • MEMBER
  • 1 POST
i HAVE TWO CODES. I HAD A BAD VACCUM HOSE AND AND BAD MAF SENSOR. RUNS GOOD. CLEARED CODES AND AFTER WARMING UP ENGINE FIRST CDE COMES ON P0171 AND THAN A LITTLE AFTER P0137. WHAT COULD THIS BE AND HOW DO I FIX IT. HAS ALOT OF POWER AND RUNS GOOD.
Nov 16, 2009 at 3:19 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Hi there,

Both these codes are indication a lean mixture problem, i would be investigating for more vacuum leaks first.

Mark (mhpautos)
Nov 16, 2009 at 3:38 PM
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