Powertrain
generic / SAE
P04F5
Catalyst Heater Circuit Low Bank 2
The control or supply line to the electric catalyst heater on bank 2 is shorted to ground or measures below the expected voltage when the heater is commanded on.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / F5
Possible causes
- Control line shorted to ground high
- Heater element internally shorted 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 b2
- Component: catalyst heater wiring b2
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012