P0455 Investigation on Your 2022 Subaru WRX
A P0455 on your 2022 WRX means the ECM detected a large EVAP leak. This new-generation WRX with the 2.4L turbo boxer produces 271 hp and is unaffected by this vapor code. The gas cap is the most likely cause.
Symptoms
- Check engine light with P0455
- Possible fuel odor
- Gas cap not clicking
- EVAP monitor incomplete
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$25.
- Purge Control Solenoid (Medium Likelihood): Sticking on the turbo boxer. $160–$300 installed.
- Vent Control Valve (Medium Likelihood): Seal failure. $130–$260 installed.
- Vapor Line (Low Likelihood): Heat damage from turbo. $80–$220.
- Charcoal Canister (Low Likelihood): Rare on newer vehicles. $220–$400 installed.
Important Note for Modified WRXs
If your WRX has aftermarket intake, exhaust, or engine management modifications, these can affect EVAP system function. Ensure all vacuum lines are properly connected after any modification work.
Warranty
Your 2022 WRX may still be under the 3-year/36,000-mile warranty. Modifications may void coverage—check with your dealer. Federal emissions warranty (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect the 2.4L turbo, 6-speed manual or CVT, AWD, or performance.