P0456 on Your 2024 CX-90: New Flagship Investigation
Your 2024 CX-90 (1st generation—Mazda's new 3-row flagship replacing the CX-9) has flagged P0456—a very small EVAP leak. The 3.3L Skyactiv-G turbo inline-six (or PHEV) uses a standard EVAP system. Fully covered under Mazda's 3yr/36k warranty through 2027.
Clues
- Check engine light on
- P0456 stored
- No drivability issues
- Gas cap may not be fully tightened
Suspects
- Gas Cap Not Seated (High Likelihood): Common on new vehicles. $0.
- Purge Solenoid Valve (Medium Likelihood): New engine platform. $0 warranty.
- Canister Vent Valve (Low Likelihood): Vent control. $0 warranty.
- Software Calibration (Low Likelihood): First-year inline-six sensitivity. $0 warranty update.
What to Do
- Reseat gas cap—tighten until click
- Mazda dealer appointment—covered through 2027
- Free warranty repair—ask about first-year TSBs
Cost
- Under warranty: $0
- 3yr/36k through 2027
- Federal emissions through 2032
Can I Drive?
Yes. P0456 has zero impact on the 3.3L turbo I6, i-ACTIV AWD, towing, or any feature.
Warranty
Mazda 3yr/36k through 2027. 5yr/60k powertrain. Federal emissions 8yr/80k through 2032. First-year model—dealer may have calibration updates.