What does code P0422 mean?
The primary catalytic converter on bank 1 is operating below the minimum efficiency level.
OBD-II Code
P0422 — Main Catalyst Efficiency Below Threshold (Bank 1
The primary catalytic converter on bank 1 is operating below the minimum efficiency level.
Common symptoms
- Check engine light on
- strong exhaust odor
- increased fuel consumption
Possible causes
- Damaged catalytic converter
- broken monolith
- exhaust leaks
Initial recommendation
Inspect catalytic converter integrity and verify upstream and downstream oxygen sensor operation.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0422 with your vehicle's actual symptoms for more complete diagnostic guidance.
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