P207F: Reductant Quality Performance
10 vehicles · 8 makes · $200-$4,500 repair
Most Reported On
P207F is an OBD-II diagnostic trouble code meaning “Reductant Quality Performance.” This code applies to diesel vehicles with a Selective Catalytic Reduction (SCR) emissions system and means the quality of the diesel exhaust fluid (DEF, also called reductant or AdBlue) does not meet the required specification. The SCR system injects DEF into the exhaust to chemically neutralize nitrogen-oxide (NOx) pollutants, and the computer monitors NOx sensors and the DEF quality sensor to confirm the fluid is doing its job. When it concludes the reductant is contaminated, diluted, the wrong fluid, or not reducing emissions effectively, it sets this code. It generally indicates a DEF quality or SCR efficiency problem and often triggers reduced power or limited restarts to force the issue to be fixed. This code is most commonly reported on 2013-2025 RAM 2500 (Big Horn, Laramie, Laramie Longhorn, Limited, Limited Longhorn, Lone Star, Rebel, SLT, Tradesman), 2014-2025 Mercedes-Benz Sprinter (Sprinter 1500, Sprinter 2500, Sprinter 3500, Sprinter 4500), and 2015-2022 Ford F-250 Super Duty, plus 7 other vehicles, with repair costs ranging from $200 to $4,500.
Common Causes
Typical Repair Cost
Based on 10 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P207F, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (10)
FAQ
What does P207F mean?
P207F stands for "Reductant Quality Performance." This code applies to diesel vehicles with a Selective Catalytic Reduction (SCR) emissions system and means the quality of the diesel exhaust fluid (DEF, also called reductant or AdBlue) does not meet the required specification. The SCR system injects DEF into the exhaust to chemically neutralize nitrogen-oxide (NOx) pollutants, and the computer monitors NOx sensors and the DEF quality sensor to confirm the fluid is doing its job. When it concludes the reductant is contaminated, diluted, the wrong fluid, or not reducing emissions effectively, it sets this code. It generally indicates a DEF quality or SCR efficiency problem and often triggers reduced power or limited restarts to force the issue to be fixed.
What are the most common causes of P207F?
The most common causes of P207F are: Contaminated, diluted, or wrong fluid in the DEF tank (e.g., water or fuel), Poor-quality or expired/degraded DEF, Faulty DEF quality sensor, Failing or clogged DEF (reductant) injector, Faulty NOx sensor(s), DEF system or exhaust leaks, Aged or damaged SCR catalyst. The specific cause varies by vehicle.
How much does it cost to fix P207F?
Repair costs for P207F range from $200 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P207F?
Au7o has documented P207F across 10 vehicle models from 8 manufacturers: Audi, Chevrolet, Dacia, Ford, GMC, Land Rover, Mercedes-Benz, RAM.
Sources (10)
- ForumCummins Forum: SCR gone bad
- ForumRamForumz: DEF issue
- mediaTruck Camper Adventure: Going Into the Dreaded Diesel DEF Limp Mode
- manufacturerBSBuilt: Maintain 6.7L Cummins DEF System (2010-2025)
- ForumRamForumz: P2048 5 MPH Derate Def system problem
- ForumThe Diesel Stop - P207F DEF Quality Code Discussions
- articleNuDef - Ford Powerstroke DEF Problems: Causes, Codes and Fixes
- NHTSANHTSA Complaint #11376453
- ForumNOX sensor question - SilveradoSierra
- otherUnited States v. Volkswagen AG et al. / 3.0L TDI Class Action Settlement
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.