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Discussion Starter #1
Several weeks ago popped a code (P0420) for low cat efficiency bank 1. checked the O2 sensors last night and all were within specs except for bank 1 sensor 2 which is aft of the Cat, it was all over the place from 0 to .9 volts. I am sure this is what popped the code.

How do I know if the sensor is bad or if teh cat is bad causing the changes in the sensor? I appear to have even pressure in the exhaust pipes when I place m hand over them.
 

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Discussion Starter #3
This is just what I was looking for- thanks

Going to hope it is just the sensor.
 
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