A P0420 diagnostic code on your 2019 Ford Explorer indicates that Bank 1's catalytic converter efficiency has fallen below acceptable thresholds. The 2019 was the last year of the 5th generation Explorer with transverse engine layout.
2019 Explorer Engine Options
- 2.3L EcoBoost 4-cylinder: 280 hp
- 3.5L V6: 290 hp
- 3.5L EcoBoost V6 (Sport): 365 hp
V6 models have dual exhaust banks - P0420 affects Bank 1.
Common Causes
- Converter Aging: Normal wear at 5+ years
- O2 Sensor Issues: Sensors may need replacement
- Exhaust Leaks: Developed over time
- Past Issues: Damage from misfires