Powertrain
generic / SAE
P20F1
SCR NOx Pre-Catalyst Over Temperature (Bank 2)
A temperature sensor at the SCR catalyst on bank 2 reports a value above the safe limit — sustained over-temperature can sinter the SCR washcoat and destroy NOx conversion.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / F1
Possible causes
- Runaway regeneration upstream high
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: 200–4000 €
- Estimated time: 1.5–8 h
- Component: scr pre catalyst
- Component: exhaust temperature sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012