Powertrain
generic / SAE
P0424
Heated Catalyst Temperature Below Threshold (Bank 1)
The heated catalyst on bank 1 does not reach its target temperature within the expected time. Common causes are a defective heater element, supply fault, or a damaged temperature sensor.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 24
Possible causes
- Heater element open or shorted high
- Catalyst temperature sensor failed 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: hard
- DIY: shop recommended
- Estimated cost: 400–1800 €
- Estimated time: 1–4 h
- Component: heated catalyst
- Component: catalyst heater
- Component: cat temperature sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012