2022 Mercedes-Benz E-Class P0456: Very Small EVAP Leak Repair

Tracking P0456 on Your 2022 E-Class

Your 2022 E-Class (W213—final years of this generation) has triggered P0456—a very small EVAP leak. The M264 2.0L turbo (E350) or M256 3.0L turbo six (E450) uses Mercedes's leak detection pump and activated charcoal filter. Mercedes-Benz 4yr/50k warranty runs through 2026.

Evidence

• Check engine light on
• P0456 stored
• No performance symptoms
• Fuel filler area may need cleaning

Suspects

1. Fuel Filler Seal (High Likelihood): Debris or wear. $0 warranty or $15–$35.
2. Leak Detection Pump (High Likelihood): Common Mercedes failure. $0 warranty or $300–$520.
3. Purge Valve (Medium Likelihood): Turbo heat cycling. $0 warranty or $190–$400.
4. EVAP Hose (Medium Likelihood): Connection. $0 warranty or $170–$340.
5. Activated Charcoal Filter (Low Likelihood): Carbon degradation. $380–$650.

Diagnostic Steps

1. Clean fuel filler area
2. Check warranty—Mercedes 4yr/50k through 2026
3. Mercedes dealer—STAR diagnostics
4. Independent Mercedes specialist if out of warranty

Costs

• Under warranty: $0
• Fuel filler seal: $15–$35
• Leak detection pump: $300–$520
• Purge valve: $190–$400

Can I Drive?

Yes. P0456 has zero impact on the engine, 4MATIC, air suspension, or performance.

Warranty

Mercedes-Benz 4yr/50k through 2026. Federal emissions 8yr/80k through 2030. Use warranty—Mercedes EVAP repairs are premium-priced.

Frequently Asked Questions