OBD-II DTC · SAE J2012

P0422

Main Catalyst Efficiency Below Threshold (Bank 1)

Catalyst → Suppressible (off-road only)

What P0422 means

P0422 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Main Catalyst Efficiency Below Threshold (Bank 1). This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.

Can this code be suppressed via ECU tuning?

Suppressible at the calibration level. Required when fitting a de-cat downpipe or running a leaner catalyst. Off-road only.

Related codes in the P04xx family

P0400P0401P0402P0403P0404P0405P0406P0407P0408P0409P0410P0411

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