A P0420 diagnostic code on your 2022 Honda Accord indicates that the catalytic converter's efficiency has dropped below the acceptable threshold. The ECM monitors converter performance and triggers this code when downstream oxygen sensor readings suggest reduced catalytic activity.
2022 Accord Engine Options
The 2022 Accord offers:
- 1.5T: 1.5L turbocharged 4-cylinder
- 2.0T: 2.0L turbocharged 4-cylinder
- Hybrid: 2.0L Atkinson cycle + electric motor
All variants can experience P0420, though diagnostic approaches may vary slightly.
Common Causes
- Catalytic Converter Degradation: Wear or contamination
- Oxygen Sensor Malfunction: False readings triggering code
- Exhaust Leaks: Air entering system affecting measurements
- Engine Running Issues: Misfires or fuel problems damaging converter
- Oil Contamination: Internal leaks fouling converter