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
  • 48,667 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
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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
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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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