P0456 on Your 2022 WRX: Investigating the Leak
Your 2022 WRX (VB generation—first year of the redesign) has triggered P0456—a very small EVAP leak. The 2.4L turbocharged Boxer (FA24) with Symmetrical AWD uses a standard EVAP system. Whether you have the 6-speed manual or CVT, the EVAP system is identical. Subaru's 3yr/36k warranty runs through 2025—check mileage.
Clues
- Check engine light on
- P0456 stored
- No performance symptoms—boost is unaffected
- Gas cap may not be fully seated
Suspects
- Gas Cap Seal (High Likelihood): Loose or worn. $0 warranty or $10–$15.
- Purge Control Solenoid Valve (High Likelihood): Turbo heat cycling. $0 warranty or $100–$230.
- Canister Vent Valve (Medium Likelihood): Vent control. $0 warranty or $110–$240.
- EVAP Hose (Medium Likelihood): Turbo environment heat. $120–$250.
- Aftermarket Intake/Tune (Low Likelihood): If modified—check EVAP line connections after any intake work. Varies.
Diagnostic Steps
- Reseat gas cap
- Check warranty—3yr/36k through 2025
- If modified, verify EVAP connections weren't disturbed
- Dealer appointment if stock and covered
- Smoke test if out of warranty ($80–$150)
Costs
- Under warranty: $0
- Gas cap: $10–$15
- Purge valve: $100–$230
- Federal emissions through 2030
Can I Drive?
Yes. P0456 has zero impact on the turbo Boxer, boost, AWD, or performance.
Warranty
Subaru's 3yr/36k through 2025—check mileage. Federal emissions 8yr/80k through 2030. Note: aftermarket modifications may void EVAP warranty coverage under Magnuson-Moss.