P0456 on Your 2019 E-Class: The Investigation
Your 2019 E-Class (W213) has triggered P0456—a very small EVAP leak. The M264 2.0L turbo or M276 3.0L twin-turbo V6 uses Mercedes's leak detection pump. Basic warranty (4yr/50k) expired. Federal emissions (8yr/80k) covers EVAP through 2027.
Clues
- Check engine light on
- P0456 stored
- No performance symptoms
- Fuel filler seal may show wear after 6+ years
Suspects
- Fuel Filler Seal (High Likelihood): Six years of wear. $15–$35.
- Leak Detection Pump (High Likelihood): Well-documented failure. Under emissions warranty or $300–$520.
- Purge Valve (Medium Likelihood): Turbo heat cycling. Under emissions warranty or $190–$400.
- EVAP Hose (Medium Likelihood): Rubber deterioration. $170–$340.
- Activated Charcoal Filter (Low Likelihood): Carbon degradation over 6 years. $380–$650.
Diagnostic Steps
- Check/replace fuel filler seal—$15–$35
- Check federal emissions warranty—8yr/80k through 2027
- Mercedes dealer or independent specialist—STAR diagnostics
- Smoke test if out-of-pocket ($100–$180)
Costs
- Fuel filler seal: $15–$35
- Leak detection pump: $300–$520 (may be emissions covered)
- Purge valve: $190–$400
- Federal emissions 8yr/80k through 2027
Can I Drive?
Yes. P0456 has zero impact on the engine, 4MATIC, or performance.
Warranty
Basic 4yr/50k expired. Federal emissions 8yr/80k covers EVAP through 2027. Mercedes EVAP repairs are expensive—use emissions warranty if eligible.