what do you think
#1
12-13-2011, 11:31 AM
#2
12-14-2011, 02:14 AM
#4
12-15-2011, 06:55 PM
Catalyst System Efficiency Below Threshold. If you are sure you have a bad catalytic converter, that is probably causing the problem and could potentially be ruining the downstream O2 sensor as unburned A/F is getting through the cat (what it is designed to burn up) and coating it.
P0420 could be caused by a bad/leaking exhaust manifold, pipe or cat, bad O2 sensor. You could remove the cat and try putting the rear O2 sensor in a spark plug anti-fouler to see if it'll keep the light off. It usually works, but not always. A for-sure way would be to wire in a resistor. There's a thread somewhere around in which someone wired one in.
P0420 could be caused by a bad/leaking exhaust manifold, pipe or cat, bad O2 sensor. You could remove the cat and try putting the rear O2 sensor in a spark plug anti-fouler to see if it'll keep the light off. It usually works, but not always. A for-sure way would be to wire in a resistor. There's a thread somewhere around in which someone wired one in.