P0420 Code Issue
Monte Of The Month -- August 2014
Joined: Sep 2008
Posts: 25,145
From: Southeast PA
Pretty sure we are all agreed that you either:
1. have no problems and the car is being very picky about the replacement
2. the replacement has gone bad
3. the replacement o2 sensor has gone bad
1. have no problems and the car is being very picky about the replacement
2. the replacement has gone bad
3. the replacement o2 sensor has gone bad
Monte Of The Month -- August 2012
Joined: Apr 2011
Posts: 6,074
From: Seattle
As previously mentioned, if the exhaust is in good condition (no leaks) and the electrical connectors at both O2 sensors are good (no broken/melted wires or loose/dirty connections) then the next diagnostic step I would take would be to collect some real time data from the sensors to insure they are operating within specification.
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6th Gen ('00-'05): Can't Get Rid of P0420 Code....
michelob
Monte Carlo Repair Help
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Feb 11, 2015 07:47 AM
