OBD-II Code
P207F
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$40–$1,800
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P207F is the reductant quality code - the ECM compares upstream and downstream NOx sensor readings during steady-state cruise and concludes the DEF being dosed is either diluted, contaminated, or not actually 32.5 percent urea.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP207F is the reductant quality code - the ECM compares upstream and downstream NOx sensor readings during steady-state cruise and concludes the DEF b…
P207F is the reductant quality code - the ECM compares upstream and downstream NOx sensor readings during steady-state cruise and concludes the DEF being dosed is either diluted, contaminated, or not actually 32.5 percent urea.
Cheapest-first ladder
- before anything else, refractometer-test the DEF in the tank (must read 32.5 plus or minus 0.7 percent urea), and inspect for water dilution, diesel fuel contamination (a common owner mistake), or expired DEF that has decomposed.
- Caveat: P207F has a regulated inducement cycle that cannot be cleared by simply draining and refilling DEF - the ECM requires a series of validated good-quality cruise cycles before lifting the inducement.
Vehicle-specific patterns2011 to 2014 Ford 6.7L Powerstroke set P207F constantly from contaminated DEF or a known failing DEF quality sensor; 2010 to 2016 Mercedes Sprinter B…
- 2011to 2014 Ford 6.7L Powerstroke set P207F constantly from contaminated DEF or a known failing DEF quality sensor;
- 2010to 2016 Mercedes Sprinter BlueTEC fail from DEF crystallization on the dosing line;
- 2009to 2014 VW/Audi Q7/Touareg 3.0 TDI BlueTEC set P207F when owners use windshield washer fluid by mistake;
- 2011to 2016 Duramax LML throw the code from a stuck-open dosing valve over-dosing then setting quality fault.
Estimated repair$40 to $1,800.
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