What Does P207F Mean?
The diesel exhaust fluid (DEF) quality sensor has detected that the reductant fluid quality is poor or contaminated. This affects the selective catalytic reduction (SCR) system's ability to properly reduce NOx emissions.
Common Causes
45%
Contaminated or degraded diesel exhaust fluid (DEF)
25%
Wrong fluid added to DEF tank (water, antifreeze, or diesel fuel)
15%
Faulty DEF quality sensor providing incorrect readings
10%
DEF contamination from tank corrosion or debris
5%
Crystallized DEF in lines or sensor due to evaporation or age
Diagnostic Steps
1
Step 1: Test DEF concentration using a refractometer; proper concentration should be 32.5% urea solution
2
Step 2: Drain DEF tank and inspect fluid for contamination, discoloration, or foreign substances
3
Step 3: Test DEF quality sensor operation using manufacturer scan tool procedures and monitor live sensor readings
4
Step 4: Inspect DEF tank for internal corrosion and check supply lines for crystallization or blockage
5
Step 5: If fluid tests good and sensor operates correctly, flush entire DEF system and refill with fresh certified DEF
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The diesel exhaust fluid (DEF) quality sensor has detected that the reductant fluid quality is poor or contaminated. This affects the selective catalytic reduction (SCR) system's ability to properly reduce NOx emissions.
The most common cause of P207F (Reductant Quality Performance) is: Contaminated or degraded diesel exhaust fluid (DEF)
Typical repair costs for P207F range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive initially but will enter reduced power mode (limp mode) after a period of time if not repaired. May eventually prevent vehicle from restarting.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P207F to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
