Tracking P0456 on Your 2022 Impreza
Your 2022 Impreza (5th generation) has triggered P0456—a very small EVAP leak. The 2.0L Boxer with Symmetrical AWD uses a traditional gas cap and standard EVAP system. Subaru's 3yr/36k warranty runs through 2025—check mileage.
Evidence
- Check engine light on
- P0456 stored
- No performance issues
- Gas cap may need reseating
Suspects
- Gas Cap Seal (High Likelihood): Loose or worn seal. $0 warranty or $10–$15.
- Purge Control Solenoid Valve (High Likelihood): Known Subaru failure. $0 warranty or $80–$190.
- Canister Vent Valve (Medium Likelihood): Vent control. $0 warranty or $90–$210.
- EVAP Hose (Medium Likelihood): Connection aging. $100–$220.
- FTP Sensor (Low Likelihood): Sensitivity drift. $120–$250.
Diagnostic Steps
- Reseat or replace gas cap
- Check warranty—3yr/36k through 2025
- Dealer appointment if covered
- If expired by mileage, clear code and monitor
Costs
- Under warranty: $0
- Gas cap: $10–$15
- Purge valve: $80–$190
- Federal emissions through 2030
Can I Drive?
Yes. P0456 has zero impact on the 2.0L Boxer, AWD, or safety.
Warranty
Subaru's 3yr/36k through 2025—check mileage. Federal emissions 8yr/80k covers EVAP through 2030.