P207F on Audi
Reductant Quality Performance
P207F on Audi vehicles indicates reductant quality performance. Au7o has documented this code across 1 Audi model — most commonly on Q7. 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.
Common Causes of P207F
- •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
P207F on Audi by Model
Audi Q7(1 issue)
- TDI Diesel Emissions Scandal and Recalls (Dieselgate)2009-2016
The 2009-2016 Audi Q7 3.0L TDI diesel was part of Volkswagen Group's emissions cheating scandal. EPA found VW/Audi failed to comply with Clean Air Act regulations - vehicles emitted up to 40x legal NOx emissions. Audi issued emissions recalls for 2009-2012 Q7 TDI (Gen 1 fix) and 2013-2016 Q7 TDI (Gen 2 fix). Some owners report reduced performance, increased DEF consumption, and DPF issues after emissions fix. Class action settlements provided compensation to affected owners.
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View P207F across all makes →Frequently Asked Questions
What does P207F mean on Audi?▼
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. On Audi specifically, this code is documented across 1 model.
What causes P207F on Audi vehicles?▼
Common causes on Audi: 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). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P207F on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P207F documented?▼
Au7o has documented P207F on 1 Audi model: Q7.