OBD-II code · Powertrain (generic, extended)
P207F Reductant Quality Performance
The ECU has concluded that the AdBlue/DEF in the tank does not meet specification. Diagnosed by comparing expected NOx reduction against the dosed reductant volume — too much dosing for too little NOx drop indicates diluted or wrong fluid.
Is it safe to drive with P207F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAdBlue diluted with water or wrong fluid filled
- Less likelyNOx sensor drift gives false reductant-quality verdict
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)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Adblue Tank, Nox Sensor, Scr Catalyst
Related codes
- P207CIntake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 2)
- P207DIntake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High (Bank 2)
- P207EIntake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Intermittent (Bank 2)
- P2080Exhaust Gas Temperature Sensor Range/Performance (Bank 1 Sensor 1)
- P2081Exhaust Gas Temperature Sensor Circuit Intermittent (Bank 1 Sensor 1)
- P2082Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.