Powertrain
generic / SAE
P0425
Catalyst Temperature Sensor (Bank 1, Sensor 1)
General electrical fault detected in the catalyst temperature sensor on bank 1 sensor position 1. The ECU uses this signal to manage heater control and protect the catalyst from overtemperature.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 25
Possible causes
- Cat temperature sensor failed high
- Wiring or connector fault medium
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.3–2 h
- Component: cat temperature sensor
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012