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
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
October, 15, 2011 AT 6:57 PM
Does an OBDII read both? Thats what I used to check with originally.
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.