A P0420 diagnostic code on your 2018 Ford F-150 indicates that Bank 1's catalytic converter efficiency has fallen below acceptable thresholds. At 6+ years old, normal wear can affect converter performance.
2018 F-150 Engine Options
- 3.3L V6: 290 hp
- 2.7L EcoBoost V6: 325 hp
- 3.5L EcoBoost V6: 375 hp
- 5.0L V8: 395 hp
All have dual exhaust banks - P0420 affects Bank 1 specifically.
Common Causes
- Converter Aging: Normal wear at 6+ years
- O2 Sensor Wear: Sensors causing false codes
- Truck Use: Towing and hauling stress
- Exhaust Leaks: Developed over time
- Past Issues: Accumulated damage from misfires