P207F: Reductant Quality Performance
The DEF quality sensor or the NOx readings suggest the DEF isn't the right concentration.
Green, yellow, red: three ways P207F can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once after topping off with fresh DEF.
Schedule a repair
Warning returns with good DEF. Diagnose the sensor or system.
Stop and get help
Countdown or derate. Stop and get help. Contaminated DEF can ruin the whole DEF system.
Symptoms you might notice
- DEF warning
- Countdown
Common causes, cheapest first
- Diluted or contaminated DEF
- Old DEF
- Failing DEF quality sensor
- Failing NOx sensor
What you can check before calling
- Think about where the DEF came from and how old it is
- Never add water or anything else to the DEF tank
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: DEF warning lights and derate: what diesel drivers need to know.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More diesel & cummins codes
- P2002
Diesel Particulate Filter Efficiency Below Threshold (Bank 1) - P2463
Diesel Particulate Filter Restriction - Soot Accumulation - P242F
Diesel Particulate Filter Restriction - Ash Accumulation - P2459
Diesel Particulate Filter Regeneration Frequency - P2453
Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance - P2454
Diesel Particulate Filter Pressure Sensor A Circuit Low
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P207F mean?
P207F means "Reductant Quality Performance". The DEF quality sensor or the NOx readings suggest the DEF isn't the right concentration.
Can I drive with code P207F?
It depends on what the vehicle is doing. Green: Set once after topping off with fresh DEF. Yellow: Warning returns with good DEF. Diagnose the sensor or system. Red: Countdown or derate. Stop and get help. Contaminated DEF can ruin the whole DEF system.
What causes P207F?
The most common causes are: diluted or contaminated DEF; old DEF; failing DEF quality sensor.
Is P207F a serious code?
It can be. Countdown or derate. Stop and get help. Contaminated DEF can ruin the whole DEF system.
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