P0440Mercedes-benz E-classYears: 1996 - 2026
Evaporative Emission Control System Malfunction
Reviewed by ASE Certified Technician
What does this mean?
Code P0440 indicates a general malfunction in the EVAP system, which prevents fuel vapors from escaping into the atmosphere. The PCM detected a problem during an EVAP system test.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mercedes-benz E-class models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Loose, damaged, or missing gas cap
Faulty EVAP purge control valve
Faulty EVAP vent valve/solenoid
Cracked or disconnected EVAP hose
Saturated or damaged EVAP charcoal canister
Symptoms to Watch For
- Check Engine Light is illuminated
- Strong fuel odor from vehicle
- Failed emissions test