Trouble code P0420 means:Catalyst system efficiency below threshold
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Usual first sign is a check engine light with a code P0420.Usual first sign is a check engine light with a code P0420.
Trouble code P0420 means:Catalyst system efficiency below threshold
If there are no exhaust leaks or other codes, the catalytic converter has failed. You will need to replace it.
Trouble code P0420 means:Catalyst system efficiency below threshold
Catalytic converter efficiency failure.
Catalytic converter effiecency failure.
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0420 means:Catalyst system efficiency below threshold
I have a 2005 Impala as well.....I bought a code scanner when my check engine light came on....2 codes came up on the scanner...P0420 and P0420PD.....'catalyst below efficiency'....My car has 115,000 miles on it and it was time for annual safety/emissions inspection so I took it in to a shop.....The catalytic converter had gone bad and had to be replaced.....which was the reason for the P0420 code....
After fixing the cause of the code, you can clear the code with a scan tool.
Trouble code P0420 means:Catalyst system efficiency below threshold