The catalytic converter for bank one is not working properly. Either a exhaust leak, a failed O2 sensor, or a failed cat.
Catalyst system efficiency below threshold, bank 1. Catalyst system efficiency below threshold, bank 1.
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
Catalyst System Efficiency Below Threshold (Bank 2)
catalyst efficiency below threshold (bank 1)
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Probably the bank 1 catalytic converter needs replacement.
P0421 code = Warm up catalyst efficiency below threshold, Bank 1
Trouble code P0430 means: Catalyst System Efficiency Bank 2 Below Threshold
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Trouble code P0422 means: Main Catalyst Efficiency Below Threshold (Bank 1)
Catalyst System Efficiency Below Threshold (Bank 1)
Code P0420 means "Catalyst System Efficency Below Threshold (Bank 1)" P0420 is actually Catalyst System Efficiency Below ThresholdCatalyst System Efficiency Below Threshold. Bank 1 is the side of the engine with cylinder #1. This code means that the catalytic converter is not cleaning the exhaust properly or the oxygen sensors are sending false info to the computer.