2002 GMC C1500 Intermittent Service Engine Light

2002 GMC C1500
102,000 MILES • 6 CYL • 2WD • AUTOMATIC
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TERRY6565
  • MEMBER
  • 1 POST
What would cause my Service Engine Soon Light to come on and off? I have pulled codes that indicated replacement of different CO2 sensors and have replaced the rear two. The light stayed off for several days and then came back on again, only to then come on and off several times.
Mar 3, 2009 at 4:58 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Hello, the code doesn't tell you what to replace, the rational thinks there is a problem in that area. The o2 sensors may be reacting to a rich or lean problem, just about anything can cause it.

If you have the spider fuel system, I'd look there first.
Mar 3, 2009 at 5:17 AM
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