1998 GMC Sierra CODES

1998 GMC SIERRA
174,000 MILES • V8 • 4WD • AUTOMATIC
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ED JONES
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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 10:51 AM
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NOSYJME
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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 9, 2012 at 3:31 AM
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RASMATAZ
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nosyjme: Go to this link for more information :http://www.obd-codes.com/p0430
Jul 9, 2012 at 3:47 AM
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NOSYJME
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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 7:29 PM
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RASMATAZ
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Dunno -could be an exhaust leak, O2 sensor or the Cat. Check/Test the downstream oxygen sensor
Jul 9, 2012 at 8:46 PM