Quote:
Originally Posted by justa25thTA
get some anti-foulers from the auto parts store. Cheap enough to try and they cured my code.
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These work. They are an item designed to set the spark plug back a couple of inches, but their threading and size mean that they can be used for O2 sensors.
Remove the downstream O2 sensor: screw the spark plug anti- fouler (also called a spark plug non- fouler... you'll need the 14mm variety, I think) into the hole, and screw the O2 sensor into that. It changes the way the O2 sensor reads the exhaust, and can clear up those pesky 420 codes.
It may not be the RIGHT way to do it, and there can sometimes be legal issues regarding their use, but at about $5/ each, they can get a person by for a while, if there's not an extra $grand$ laying around for new cats.
Google it, YouTube it... you'll get more info on it. I stumbled across this "miracle cure" online, spend $10 for a pair of them, and it took me about 10 minutes for the whole job. It's not guaranteed, but USUALLY seems to work. It worked for me...