2022 Subaru Impreza P0455: Large EVAP Leak Diagnosis

P0455 on Your 2022 Subaru Impreza

A P0455 on your 2022 Impreza means a large EVAP leak was detected. Your 2.0L boxer engine and Symmetrical AWD are unaffected—this is strictly a vapor system issue. The gas cap is the most common culprit.

Evidence

• Check engine light illuminated
• P0455 stored in ECM memory
• Possible fuel odor
• Gas cap not clicking

Causes Ranked

1. Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
2. Purge Control Solenoid (Medium Likelihood): Sticking valve. $140–$260 installed.
3. Vent Control Valve (Medium Likelihood): Seal failure. $120–$240 installed.
4. Vapor Hose (Low Likelihood): Cracked connection. $80–$180.
5. Charcoal Canister (Low Likelihood): Rare on newer vehicles. $200–$380 installed.

Next Steps

Tighten or replace the gas cap. Drive 2–3 days. If P0455 returns, visit a Subaru dealer—your warranty may cover it.

Warranty

Your 2022 Impreza may still be under the 3-year/36,000-mile basic warranty. The federal emissions warranty (8yr/80k) covers EVAP through 2030.

Safe to Drive?

Yes. P0455 is a vapor code. The 2.0L boxer, CVT, AWD, and EyeSight function normally.

Frequently Asked Questions