TROUBLE CODE P0430 IS IT BAD CAT. OR SENSOR

  • Tiny
  • LOUGAR
  • 2002 GMC Yukon
  • 168,000 miles

P0430 says catalyst system efficency below threshold bank 2.

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Saturday, October 15th, 2011 AT 5:12 PM

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  • Tiny
  • hmac300
  • Expert
  • 44,405 posts

It can be a bad cat, an air leak on the exaust sytem on that side (right) or you could be leaking a intake/headgasket gettting water on it occasionally coooling it down

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Saturday, October 15th, 2011 AT 6:17 PM
  • Tiny
  • hmac300
  • Expert
  • 44,405 posts

Oops it cold also be a bad O2 sensor but you need a code scanner that can read both O2sensors to see if they are working correctly

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Saturday, October 15th, 2011 AT 6:18 PM
  • Tiny
  • LOUGAR
  • Member

Does an OBDII read both? Thats what I used to check with originally.

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Saturday, October 15th, 2011 AT 6:57 PM
  • Tiny
  • hmac300
  • Expert
  • 44,405 posts

Yes bu tyou need to have the more exspensive model that will read it. Most only read the code or erase it. Usually the more exspensive model runs about $500 at least and you are better off dumping themoney into the vehicle instead of using something like that.

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Saturday, October 15th, 2011 AT 6:59 PM

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