Investigating P0446 on Your 2022 Audi Q5
A P0446 code on your 2022 Audi Q5 points to an EVAP vent control circuit malfunction. The FY-generation Q5 uses the 2.0L TFSI turbo on the MLB Evo platform with quattro AWD. The EVAP system features an activated charcoal canister shut-off valve for vent control and the N80 purge regulator valve—a documented weak point shared across VW/Audi platforms.
The Audi basic warranty (4yr/50k) may still be active. Check your purchase date and mileage.
Clues and Symptoms
- Check engine light with P0446
- Fuel fill difficulty
- EVAP readiness monitor incomplete
- Possible fuel vapor odor
Top Suspects
- Activated Charcoal Canister Shut-Off Valve Failure (High Likelihood): The vent shut-off valve fails. quattro AWD adds underbody complexity affecting routing. Replacement costs $160–$310 if not warranty-covered.
- N80 Purge Regulator Valve Malfunction (High Likelihood): Known VW/Audi weak point. Sticking or internal failure. Replacement runs $140–$270.
- Shut-Off Valve Wiring or Connector (Medium Likelihood): Connector corrosion from underbody exposure. Repair costs $90–$200.
- Plastic EVAP Component Deterioration (Medium Likelihood): Audi uses plastic EVAP components that can become brittle with age and heat cycles. Repair runs $80–$200.
- Gas Cap Seal (Low Likelihood): Worn seal. Replacement is $15–$35.
How to Investigate
Use VCDS/VAG-COM (~$200) for dealer-level diagnostics or have an Audi dealer use ODIS. VCDS provides commanded valve testing and detailed EVAP readouts. Check the N80 purge valve first—it's the most common VAG EVAP failure. Inspect the canister shut-off valve connector.
Warranty and Cost
The basic warranty (4yr/50k) may still apply. The federal emissions warranty (8yr/80k) covers EVAP through 2030. Out of warranty: $140–$310.
Safe to Drive?
Yes. P0446 doesn't affect your Q5's engine performance, quattro AWD, transmission, or any driving features.