What does code P0422 mean?

Main Catalyst Efficiency Below Threshold (Bank 1): The main catalytic converter on bank 1 has reduced efficiency.

P0422 is rated as medium severity. Schedule service — affects performance or emissions.

P0422

Main Catalyst Efficiency Below Threshold (Bank 1)

Powertrain Code · Medium

What does P0422 mean?

The main catalytic converter on bank 1 has reduced efficiency.

System: Catalytic Converter

P0422 is a powertrain diagnostic trouble code indicating main catalyst efficiency below threshold (bank 1). This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.