Tracking Down P0455 on Your 2019 Subaru Forester
A P0455 on your 2019 Forester indicates a large EVAP system leak. This 5th-generation Forester with the 2.5L boxer engine is out of basic warranty but may still be covered under federal emissions. The gas cap is the first clue to investigate.
Evidence to Look For
- Check engine light on with P0455
- Faint fuel smell, especially in warm weather
- Gas cap loose or not clicking properly
- Failed emissions inspection
Causes Ranked by Likelihood
- Gas Cap Seal (Very High Likelihood): After 5+ years, seals degrade. $10–$25 replacement.
- Purge Control Solenoid (Medium Likelihood): Subaru's purge valve fails with age. $150–$280 installed.
- Vent Control Valve (Medium Likelihood): Common on aging Subarus. $120–$250 installed.
- Vapor Hoses (Low-Medium Likelihood): Heat cycling near the boxer engine can crack lines. $80–$200.
- Charcoal Canister (Low Likelihood): Saturated from overfilling fuel. $200–$400 installed.
Diagnostic Steps
Replace the gas cap first—it's cheap insurance. If P0455 returns after 2–3 drive cycles, have a smoke test performed. At 5+ years old, rubber hoses and seals are prime suspects. Subaru dealers use SSM4 for EVAP diagnostics.
Warranty and Cost
Your 2019 Forester's basic warranty has expired. However, the federal emissions warranty (8yr/80k) covers EVAP components through 2027—check your mileage. Out-of-pocket repairs range from $10 (gas cap) to $400 (canister).
Safe to Drive?
Yes. P0455 doesn't affect the 2.5L boxer, CVT, Symmetrical AWD, or EyeSight. It's a vapor leak, not a performance issue.