OBD code P207F

The system detects that AdBlue quality or concentration is not allowing correct NOx reduction.

Estimated severity

High

Common symptoms

AdBlue or emissions warning
Check engine light on
Start countdown in some vehicles
P20EE or other SCR codes may also be present
Usually no obvious mechanical symptom at first

Likely causes

Contaminated, old or incorrect-concentration AdBlue
Wrong fluid added to the tank
Faulty reductant quality sensor
Crystallization in the AdBlue injector or line
Insufficient dosing that looks like poor quality
Incorrect or aged NOx sensor

Recommended checks

1. Confirm what fluid was added and when.
2. Check AdBlue quality or concentration with the proper tool if available.
3. Drain and refill with correct AdBlue if contamination is suspected.
4. Inspect injector and lines for white crystals.
5. Read NOx sensors and SCR module codes before replacing the tank or catalyst.

What does code P207F mean?

P207F is associated with reductant or AdBlue quality, or with an SCR system behaving as if the fluid concentration is incorrect. There may be contaminated AdBlue, fluid diluted with water, crystallization at the injector, a faulty quality sensor or a dosing issue that is interpreted as poor fluid quality.

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