P0456 on Your 2024 E-Class: New Generation Investigation
Your 2024 E-Class (W214—all-new generation) has flagged P0456—a very small EVAP leak. The M254 2.0L turbo (E300) or M256 3.0L turbo six (E450) uses Mercedes's leak detection pump and activated charcoal filter. First year of the new generation—fully covered under Mercedes-Benz's 4yr/50k warranty through 2028.
Clues
- Check engine light on
- P0456 stored
- No drivability issues
- Fuel filler may have debris
Suspects
- Fuel Filler Seal (High Likelihood): Debris in filler. $0 warranty.
- Leak Detection Pump (High Likelihood): First-year component. $0 warranty.
- Purge Valve (Medium Likelihood): Manufacturing variance. $0 warranty.
- Software Calibration (Low Likelihood): New platform sensitivity. $0 warranty update.
What to Do
- Clean fuel filler area
- Mercedes dealer appointment—covered through 2028
- Free warranty repair via STAR diagnostics
- Ask about first-year W214 calibration updates
Cost
- Under warranty: $0
- 4yr/50k through 2028
- Federal emissions through 2032
Can I Drive?
Yes. P0456 has zero impact on the engine, 4MATIC, air suspension, or any system.
Warranty
Mercedes-Benz 4yr/50k through 2028. Federal emissions 8yr/80k through 2032. First-year W214—dealer may have calibration updates.