P1420 Catalyst Temperature Sensor Fault
What does P1420 mean on a Ford?
P1420 — Catalyst Temperature Sensor Fault. This Ford-enhanced code applies to Ford models with catalyst temperature monitoring.
Common causes of P1420
- Failed catalyst temperature sensor
- Open or shorted sensor circuit
- Heat-damaged sensor wiring
- Corroded connector
- PCM input fault
How to fix P1420
- Inspect sensor wiring for heat damage
- Test sensor resistance
- Check circuit continuity
- Verify exhaust temperatures are sane
- Replace the sensor after circuit checks