A P0420 diagnostic code on your 2022 Toyota Corolla indicates that the catalytic converter efficiency has fallen below acceptable levels. The Corolla's 4-cylinder engine uses a single exhaust bank configuration.
2022 Corolla Engine Options
- 2.0L Dynamic Force: 169 hp (sedan/hatchback)
- 1.8L Hybrid: Combined 121-134 hp
Common Causes
- Converter Issues: Wear or contamination
- O2 Sensor Problems: False codes from faulty sensors
- Exhaust Leaks: Air entering system affecting readings
- Engine Problems: Misfires damaging converter
Warranty Note
A 2022 Corolla should be under emissions warranty (8 years/80,000 miles).