P0420 bank one catalytic converter efficiency failure.
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0420 means:Catalyst system efficiency below threshold
Its an engine management light and will need to be plugged into a computer at a engine diagnostic garage as it could be a number of things and only the codes will tell you which part is faulty.
Low catalytic converter efficiency.
As far as I know you can't. If you need engine codes ran and are too cheap to take it to get a full diagnostic, take it to Autozone. They will run the codes for you free of charge and tell you what they mean.
You need to have a diagnostic meter to read the codes, then book to tell you what they mean.
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
catalytic converter failure.
Trouble code P0420 means:Catalyst system efficiency below threshold
P0420 : catalyst efficiency failure. You have a failed catalytic converter.