A P0420 diagnostic code on your 2023 Honda Ridgeline indicates that Bank 1's catalytic converter efficiency has dropped below acceptable levels. The Ridgeline's 3.5L V6 features a dual-bank exhaust with separate converters.
2023 Ridgeline Configuration
The 2023 Ridgeline continues with Honda's proven 3.5L V6 producing 280 horsepower. The dual exhaust system means P0420 specifically affects Bank 1, while P0430 would indicate Bank 2 issues.
P0420 on a Newer Vehicle
A 2023 Ridgeline showing P0420 is somewhat early for converter failure. Consider:
- O2 Sensor Issues: Sensors may be causing false codes
- Exhaust Leaks: Connections may have loosened
- Usage Pattern: Heavy towing can accelerate wear
- Manufacturing Variation: Some converters fail earlier
Warranty Coverage
A 2023 Ridgeline should be under full warranty including 8-year/80,000-mile emissions coverage.