trouble code P0430 is it bad cat. or sensor

2002 GMC YUKON
168,000 MILES
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LOUGAR
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P0430 says catalyst system efficency below threshold bank 2.
Oct 15, 2011 at 5:12 PM
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HMAC300
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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
Oct 15, 2011 at 6:17 PM
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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
Oct 15, 2011 at 6:18 PM
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LOUGAR
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Does an OBDII read both? Thats what I used to check with originally.
Oct 15, 2011 at 6:57 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
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.
Oct 15, 2011 at 6:59 PM
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