P0456 on Your 2023 CX-9: The Final Year
Your 2023 CX-9 (2nd generation—final production year before the CX-90 replacement) has triggered P0456—a very small EVAP leak. The 2.5L Skyactiv-G turbo uses a standard EVAP system. Mazda 3yr/36k warranty runs through 2026.
Evidence
- Check engine light on
- P0456 stored
- No drivability issues
- Gas cap may not be fully seated
Suspects
- Gas Cap Seal (High Likelihood): Loose or debris. $0 warranty.
- Purge Solenoid Valve (High Likelihood): Standard failure. $0 warranty.
- Canister Vent Valve (Medium Likelihood): Vent control. $0 warranty.
- EVAP Hose (Low Likelihood): Connection. $0 warranty.
What to Do
- Reseat gas cap firmly
- Mazda dealer appointment—covered through 2026
- Free warranty repair
Cost
- Under warranty: $0
- 3yr/36k through 2026
- Federal emissions through 2031
Can I Drive?
Yes. P0456 has zero impact on the turbo, AWD, towing, or 3rd row.
Warranty
Mazda 3yr/36k through 2026. 5yr/60k powertrain. Federal emissions 8yr/80k through 2031. Final year—parts remain available through Mazda.