TROUBLE CODE P0430 IS IT BAD CAT. OR SENSOR

2002 GMC Yukon

Tiny

LOUGAR

October, 15, 2011 AT 5:12 PM

P0430 says catalyst system efficency below threshold bank 2.

FOUND 64 RELATED QUESTIONS

4 Answers

Tiny

hmac300

October, 15, 2011 AT 6:17 PM

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

Tiny

hmac300

October, 15, 2011 AT 6:18 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

Tiny

LOUGAR

October, 15, 2011 AT 6:57 PM

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

Tiny

hmac300

October, 15, 2011 AT 6:59 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.

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