Powertrain
generic / SAE
P24F3
Reductant Tank Temperature/Fuel Temperature Correlation
After a long key-off soak the AdBlue/DEF tank temperature and the fuel tank temperature should read close to each other (both at ambient). The ECM detects an implausible spread, which usually means one of the two sensors drifts, is wired wrong, or has a heat source nearby that the plausibility model does not account for.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / F3
Possible causes
- One temperature sensor drifting outside tolerance high
- Recently active reductant tank heater warming the tank above ambient medium
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–600 €
- Estimated time: 0.5–2 h
- Component: reductant tank temperature sensor
- Component: fuel tank temperature sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012