A P0420 diagnostic code on your 2018 Toyota Camry indicates that the catalytic converter efficiency has fallen below acceptable thresholds. The 2018 model year was the first of the current-generation Camry with new TNGA platform and Dynamic Force engines.
2018 Camry Engine Options
- 2.5L Dynamic Force 4-cyl: 203 hp
- 2.5L Hybrid: Combined 208 hp
- 3.5L V6: 301 hp (Bank 1 specific for P0420)
Common Causes
- Converter Aging: Normal wear at 6+ years
- O2 Sensor Failure: Sensors triggering false codes
- Exhaust Leaks: Air entering affecting measurements
- Past Engine Issues: Previous misfires damaging converter
- Oil Consumption: Internal leaks contaminating converter