Investigating P0455 on Your 2022 Audi A4
A P0455 on your 2022 A4 (B9.5 facelift) indicates a large EVAP leak. The 2.0L TFSI turbo-4 uses VAG's EVAP system with the N80 purge valve and leak detection pump. Your warranty runs through 2026.
Evidence
- Check engine light on
- P0455 stored in ECU
- Possible fuel smell
- Gas cap not seating
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$30.
- N80 Purge Valve (Medium Likelihood): VAG-specific solenoid. $150–$320 installed.
- Leak Detection Pump (Medium Likelihood): VAG LDP module. $200–$400 installed.
- EVAP Canister (Low-Medium Likelihood): Saturation. $280–$500 installed.
- Fuel Tank Breather Valve (Low Likelihood): Seal failure. $140–$300 installed.
Diagnosis
Gas cap first. If P0455 persists, VCDS or ODIS diagnostics will pinpoint the fault. The N80 valve is a known wear item on VAG platforms.
Warranty
Audi's 4yr/50k warranty runs through 2026. Federal emissions (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect TFSI performance, quattro, or any features.