A P0420 diagnostic code on your 2022 Toyota Prius indicates that the catalytic converter efficiency has dropped below acceptable levels. The 2022 Prius uses Toyota's proven hybrid powertrain with a catalytic converter on the gasoline engine.
2022 Prius System
The 2022 Prius uses a 1.8L Atkinson-cycle 4-cylinder (52 hp engine, 121 hp system combined). This is the last year of the 4th generation Prius before the 2023 redesign.
Common Causes
- Converter Issues: Wear or contamination
- O2 Sensor Problems: False codes from faulty sensors
- Hybrid System Issues: Engine management affecting converter
- Theft Check: Prius converters are highly targeted
Warranty Note
A 2022 Prius should be under emissions warranty.