2002 Chevrolet Blazer • 117,640 miles
Obd 11 scanner keeps coming up with p0420 code, something keeps triggering the check engine light to come on and have no ides what. changed spark plugs& wires, replaced front o2 sensor and replaced cat converter.. checked for vac leaks and found none also checked for any oil leaking anywhere and found nothing... what else could be wrong
February 22, 2012.
February 22, 2012.
So which one would it be? i replaced the front o2 sensor.. so is it the rear one
I would think it must be the rear . could possibly be restricted convertor i would have it checked at exhaust shop. this code is not specifically for the 02 sensor rather insufficient flow in the exhaust .so you really need to eliminate the possibility of a bad convertor first.
So is taking it to a shop the only way to find out if its the converter? which should i try first? replacing the rear o2 sensor or having the converter looked at?
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