Powertrain
generic / SAE
P04F6
Catalyst Heater Circuit High Bank 1
Same as P04F4 with the line shorted to supply or open - the ECU measures higher voltage than the commanded duty cycle allows.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / F6
Possible causes
- Control line shorted to supply high
- Open in heater element or harness medium
- Connector pins corroded - high contact resistance low
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: 300–2200 €
- Estimated time: 1.5–5 h
- Component: electric catalyst heater b1
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012