P0430 says catalyst system efficency below threshold bank 2.
Oct 15, 2011 at 5:12 PM
trouble code P0430 is it bad cat. or sensor
2002 GMC YUKON
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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
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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Does an OBDII read both? Thats what I used to check with originally.
Oct 15, 2011 at 6:57 PM
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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