A P0420 diagnostic code on your 2023 Toyota Prius indicates that the catalytic converter efficiency has dropped below acceptable thresholds. The completely redesigned 2023 Prius features a new powertrain.
2023 Prius Changes
The 2023 Prius is completely new with:
- 2.0L 4-cylinder Hybrid: 194 hp combined (vs 121 hp previous)
- Prius Prime: 220 hp combined plug-in hybrid
The new powertrain includes an updated exhaust and catalyst system.
P0420 on a New Vehicle
A 2023 Prius showing P0420 is unusual since converters rarely fail this early:
- O2 Sensor Issues: More likely than converter failure
- New Platform: May have calibration needs
- Theft Check: Prius converters remain theft targets
Warranty Coverage
A 2023 Prius is fully covered under warranty.