Catalyst system efficiency below threshold, bank 1. Catalyst system efficiency below threshold, bank 1.
Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
Code P0420-Catalyst Efficiency Below Threshhold You will need to replace the catalytic converter and O2 sensors.
After googling it is determined Code P0420 ( Catalytic converter effeciency below threshold)
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P0700 means:Transmission control system malfunction
Trouble code P0420 means: Catalyst Efficiency Below Threshold (Bank 1)
Trouble code P0420 means:Catalyst system efficiency below threshold
Trouble code P1739 means: TCM A/T controller circuit
Trouble code P0420 means: Catalyst Efficiency Below Normal (Bank 1)
Trouble code P0420 means: Secondary Air Injection System
There are a number of things that could be causing the P0420 catalyst efficiency code. The most common thing is the catalytic converter is no longer working. The other thing is the rear oxygen sensor is no longer working properly or there is a leak in the exhaust system.