Powertrain
generic / SAE
P04FF
Catalyst Heater Circuit Performance Bank 2
The catalyst heater on bank 2 is electrically intact but does not deliver the expected thermal effect - measured catalyst light-off time is longer than calibrated. Heater element ageing, increased contact resistance, or a partial winding failure are typical causes.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / FF
Possible causes
- Heater element aged - reduced power output high
- Increased contact resistance in supply 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: 400–2500 €
- Estimated time: 2–6 h
- Component: electric catalyst heater b2
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012