Tracking P0456 on Your 2022 Forester
Your 2022 Forester (5th generation, SK) has triggered P0456—a very small EVAP leak. The 2.5L Boxer with Symmetrical AWD uses a traditional threaded gas cap and standard EVAP system. Subaru's 3yr/36k warranty runs through 2025—check mileage to see if you're still covered.
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 point. $0 warranty or $90–$210.
- Canister Vent Valve (Medium Likelihood): Vent control. $0 warranty or $100–$230.
- EVAP Hose (Medium Likelihood): Connection aging. $110–$240.
- Charcoal Canister (Low Likelihood): Fuel overfilling damage. $200–$380.
Diagnostic Steps
- Reseat or replace gas cap
- Check warranty—Subaru 3yr/36k runs through 2025
- If covered, dealer appointment—ask about EVAP TSBs
- If expired, clear code, drive cycle, smoke test if persistent
Costs
- Under warranty: $0
- Gas cap: $10–$15
- Purge valve: $90–$210
- Federal emissions through 2030
Can I Drive?
Yes. P0456 has zero impact on the Boxer engine, AWD, or EyeSight.
Warranty
Subaru's 3yr/36k through 2025—check mileage. 5yr/60k powertrain. Federal emissions 8yr/80k covers EVAP through 2030.