P249F on Audi
Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)
P249F on Audi vehicles indicates diesel particulate filter pressure sensor intermittent/erratic (bank 2). Au7o has documented this code across 1 Audi model — most commonly on Q7. This is a diesel emissions code. The diesel particulate filter (DPF) traps soot from the exhaust, and a pressure sensor measures the pressure difference across the filter so the computer knows how full it is and when to run a cleaning (regeneration) cycle. P249F means the DPF pressure sensor signal on Bank 2 is intermittent or erratic — the reading jumps around or cuts out unpredictably rather than staying steady. This can cause the computer to misjudge soot levels, trigger unnecessary or failed regenerations, and may put the engine into a reduced-power mode.
Common Causes of P249F
- •Faulty or aging DPF differential pressure sensor
- •Loose, cracked or kinked pressure sensor hoses/tubes
- •Soot, moisture or carbon clogging the sensor lines
- •Loose or intermittent electrical connector at the sensor
- •Chafed or partially broken sensor wiring
- •Corrosion or water intrusion in the connector
- •Faulty ECM/sensor reference signal (less common)
P249F 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 P249F across all makes →Frequently Asked Questions
What does P249F mean on Audi?▼
P249F stands for "Diesel Particulate Filter Pressure Sensor Intermittent/Erratic (Bank 2)." This is a diesel emissions code. The diesel particulate filter (DPF) traps soot from the exhaust, and a pressure sensor measures the pressure difference across the filter so the computer knows how full it is and when to run a cleaning (regeneration) cycle. P249F means the DPF pressure sensor signal on Bank 2 is intermittent or erratic — the reading jumps around or cuts out unpredictably rather than staying steady. This can cause the computer to misjudge soot levels, trigger unnecessary or failed regenerations, and may put the engine into a reduced-power mode. On Audi specifically, this code is documented across 1 model.
What causes P249F on Audi vehicles?▼
Common causes on Audi: Faulty or aging DPF differential pressure sensor, Loose, cracked or kinked pressure sensor hoses/tubes, Soot, moisture or carbon clogging the sensor lines, Loose or intermittent electrical connector at the sensor, Chafed or partially broken sensor wiring. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P249F on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P249F documented?▼
Au7o has documented P249F on 1 Audi model: Q7.