2004 GMC C2500 sensor codes

Tiny
COREY D HELGEMO
  • MEMBER
  • 2004 GMC C2500
  • V8
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
I have a 2004 gmc sierra 2500 hd and my check engine light is on and I had hooked it to a test set and was told that all 4 of my o2 sensors were bad. Now I heard that all the sensors wont go bad at the same time and that it could be a vacum leak or a fuel pump issue. How true is that and what could it possibly be.
Wednesday, April 29th, 2009 AT 8:50 PM

1 Reply

Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
What kind of tests set? That is probably your problem, I suggest you take it somewhere and have them put a real meter (scanner) on it that will tell you which one it is, and which side its on and if it's a forward or backward one, keep in mind O2 sensors are only good for about 60,000 mile, now to answer your next question, yes a vacuum leak or a fuel pump issue will cause your O2 sensors to malfunction, but you are not describing any other problems you are experiencing with your vehicle, so have it re-diagnosed and let me know what happened.
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Thursday, May 21st, 2009 AT 11:13 AM

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