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Old 11-04-2015, 11:44 AM   #1 (permalink)
Join Date: Apr 2014
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triplem399 is on a distinguished road
Default P0420 2006 Forenza

I have the check engine code P0420 (catalyst system efficiency threshold bank 1). I had a new catalytic converter installed and a short time later the same code came back. In order for the company to warranty the catalytic converter the mechanic had to take a series of steps in order to eliminate any other possible problems in order for the catalytic converter to be covered under warranty. I think they cleaned the upper intake along with a few other requirements but the code once again reappeared. The catalytic converter was replaced under warranty. About 6 months later the same P0420 code came back. I replaced both the bank 1 (upstream) and bank 2 (downstream) O2 sensors, cleared the code only for it to come back at about the 108 mile mark. I am at a total loss as to what to do, would anybody have any idea as to what else I can do?
Thanks in advance,
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