1998 GMC Sierra CODES

1998 GMC SIERRA
174,000 MILES • V8 • 4WD • AUTOMATIC
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ED JONES
  • MEMBER
  • 1 POST
hELLO i have 3 codes and need to know what to get to fix this truck.The first is P1870 2ND P1345 3RD P0430 tHANKS FOR THE GREAT WEB SITE TOOO
Apr 19, 2010 at 3:51 AM
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NOSYJME
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  • 2 POSTS
Hopefully you get a reply soon... I have a 2001 GMC Sierra w/273,000 miles and the check engine light is on and it gave us a P0430 code last week.... I need to know what to replace so it will pass the smog test!
Jul 8, 2012 at 8:31 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
nosyjme: Go to this link for more information :http://www.obd-codes.com/p0430
Jul 8, 2012 at 8:47 PM
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NOSYJME
  • MEMBER
  • 2 POSTS
rasmataz: Thank You... I am just wondering because I have the 4.8 ltr, it says "Oxygen storage ability of catalyst (right cylinder bank) below calibrated threshold" Does this mean I can get away with new O2 sensor, and which ones do I replace? Or am I screwed because I cannot afford to replace the Cats?
Jul 9, 2012 at 12:29 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Dunno -could be an exhaust leak, O2 sensor or the Cat. Check/Test the downstream oxygen sensor
Jul 9, 2012 at 1:46 PM
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