A P0420 diagnostic code on your 2023 Honda Pilot indicates that Bank 1's catalytic converter efficiency has dropped below acceptable levels. The redesigned 2023 Pilot features an updated V6 and exhaust system, though P0420 diagnosis remains similar to previous generations.
2023 Pilot Updates
The 2023 Pilot was completely redesigned with an updated 3.5L V6 producing 285 horsepower. The exhaust system maintains a dual-bank configuration with separate catalytic converters for each bank.
P0420 on a New Vehicle
A 2023 Pilot showing P0420 is unusual since catalytic converters rarely fail this early. Likely causes include:
- O2 Sensor Issues: Faulty sensors creating false codes
- Manufacturing Defect: Rare but possible on new parts
- Exhaust System Problem: Loose connections or leaks
- Software Calibration: ECM may need update
Warranty Coverage
A 2023 Pilot is fully covered under warranty. Have Honda dealer diagnose at no cost.