P0456 on Your 2019 Forester: Following the Trail
Your 2019 Forester (5th generation, SK—first year of the redesign) has triggered P0456—a very small EVAP leak. The 2.5L Boxer with Symmetrical AWD uses a traditional EVAP system. Basic warranty has expired, but federal emissions (8yr/80k) covers EVAP through 2027.
Clues
- Check engine light on
- P0456 stored
- No drivability symptoms
- Gas cap may show wear after 6+ years
Suspects
- Gas Cap Seal (High Likelihood): Six years of use. $10–$15.
- Purge Control Solenoid Valve (High Likelihood): Known Subaru weak point—TSBs exist for the SK platform. Under emissions warranty or $90–$210.
- Canister Vent Valve (Medium Likelihood): Age-related wear. Under emissions warranty or $100–$230.
- EVAP Hose (Medium Likelihood): Rubber deterioration. $110–$240.
- Charcoal Canister (Low Likelihood): Fuel overfilling saturation. $200–$380.
Diagnostic Steps
- Replace gas cap—$10–$15
- Clear code, drive 2–3 cycles
- If persistent, check federal emissions warranty—8yr/80k through 2027
- Dealer appointment—ask about first-year SK platform TSBs
- Smoke test ($80–$150) if out-of-pocket
Costs
- Gas cap: $10–$15
- Purge valve: $90–$210 (may be emissions warranty covered)
- Canister vent valve: $100–$230
- Federal emissions 8yr/80k through 2027
Can I Drive?
Yes. P0456 has zero impact on the Boxer engine, AWD, or safety.
Warranty
Basic 3yr/36k expired. Powertrain 5yr/60k expired. Federal emissions 8yr/80k covers EVAP through 2027. First year of the 5th gen—ask about applicable TSBs.