Quote:
Originally Posted by NewArt
Yes, you are probably right. I have replaced the sensor but the readings still indicate a cat problem. Marbe I'll try a smoke test on the exhaust to check for leaks. I changed the AOS in the spring and the MAF is fairly new as well. Hopefully it's not really the cat. Major $ !
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Maybe pull and compare spark plugs on both banks. If one side is heavily carboned, you know there is oil in the combustion chamber.