noobish question but, i have a p0420 catalyst efficiency below thresh hold bank one. which o2 is this? or is it the cat. my first assumption was the front o2 sensor. but advance says its a bad cat. its a 05 n/a with 140ish k miles on it.
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03-05-2011
noobish question but, i have a p0420 catalyst efficiency below thresh hold bank one. which o2 is this? or is it the cat. my first assumption was the front o2 sensor. but advance says its a bad cat. its a 05 n/a with 140ish k miles on it.
Originally Posted by SuperSport
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