Reductant Quality Performance
The P207F code indicates that the Diesel Exhaust Fluid (DEF) quality sensor has detected that the reductant (DEF/AdBlue) is not meeting the required concentration or purity standards. This can be caused by contaminated DEF, incorrect fluid, or a faulty sensor. The system monitors the quality to ensure proper NOx reduction in the Selective Catalytic Reduction (SCR) system.
01. Most Common Causes
- Contaminated or diluted DEF
- Incorrect fluid (e.g., water or diesel) in DEF tank
- Faulty DEF quality sensor
- DEF heater or wiring issues
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Increased emissions
- Possible DEF warning message on dashboard
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P207F is present.
Step 2: Check DEF level and quality using a refractometer or test strip.
Step 3: Inspect DEF tank for contamination or incorrect fluid.
Step 4: Test DEF quality sensor and wiring for faults.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it may cause reduced power and increased emissions. The vehicle may enter limp mode to protect the SCR system.
How much does it cost to fix?▼
If the issue is contaminated DEF, draining and refilling costs $50-$150. If the sensor needs replacement, parts and labor can range from $200-$500.