Tracking Down P0440 on Your 2024 Mercedes-Benz E-Class
Your 2024 Mercedes-Benz E-Class (W214) has flagged a P0440 code — an EVAP system malfunction. The all-new W214 offers the E 350 (2.0L turbo with EQ Boost, 255 hp) or E 450 (3.0L turbo inline-six with EQ Boost, 375 hp), both with 9G-TRONIC automatic and available 4MATIC. As a brand-new vehicle, P0440 is likely minor. Let's examine the evidence.
Symptoms to Watch For
- Check engine light illuminated
- Faint gasoline odor
- Slight fuel economy decrease
- Fuel nozzle clicking off early
- Failed emissions inspection
Your E-Class drives perfectly normally. All powertrain and luxury systems are unaffected.
Top Suspects: Ranked by Likelihood
- Fuel Filler Issue — Check the filler system. Estimated repair: $0–$35.
- Leak Detection Pump (LDP) — Mercedes's EVAP diagnostic pump. Possible defect on new platform. Estimated repair: $165–$400 (warranty-covered).
- Purge Valve (Regeneration Valve) — Controls vapor flow. Estimated repair: $125–$300 (warranty-covered).
- Shut-Off Valve — Controls EVAP venting. Estimated repair: $135–$320 (warranty-covered).
- EVAP Connection — Loose factory fitting on new platform. Estimated repair: $0–$140 (warranty).
Diagnostic Steps
- Check fuel filler, clear code, drive 50+ miles
- Schedule Mercedes dealer appointment — warranty applies
- Dealer will use XENTRY diagnostics
- Check for TSBs on the new W214
Repair Cost Breakdown
- Fuel filler: $0–$35
- LDP: $165–$400 (warranty)
- Purge valve: $125–$300 (warranty)
- Shut-off valve: $135–$320 (warranty)
- EVAP connection: $0–$140 (warranty)
Warranty: Your 2024 E-Class is covered by Mercedes-Benz's 4-year/50,000-mile warranty. All EVAP repairs are free.
Can I Drive With P0440?
Yes. P0440 is emissions-only. Your E-Class is fully functional.
DIY or Dealer?
Dealer — Mercedes warranty covers the repair at no cost.