A P0420 diagnostic code on your 2022 Toyota 4Runner indicates that Bank 1's catalytic converter efficiency has dropped below acceptable levels. The 2022 4Runner continues with Toyota's reliable 4.0L V6 engine.
2022 4Runner Engine
The 2022 4Runner uses the same 4.0L V6 (270 hp) that's been in the 4Runner for years. This naturally aspirated V6 has dual exhaust banks - P0420 affects Bank 1.
Common Causes
- Converter Issues: Wear or contamination
- O2 Sensor Problems: False codes from sensors
- Exhaust Leaks: Air entering system
- Physical Damage: Off-road impacts
- Theft Check: Verify converter is present
Warranty Note
A 2022 4Runner should be under emissions warranty.