HomeBrandsMercedes-BenzSedansp0442
M
p0442
Easy Fix
Mercedes-Benz · Sedans
Evaporative Emission Control System Leak Detected (Small Leak)
Quick Answer
Error code P0442 on your Mercedes-Benz Sedans means: Evaporative Emission Control System Leak Detected (Small Leak). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
W177W206W214V297A220 2024A220 4MATIC 2024AMG A35 4MATIC 2024AMG C43 4MATIC 2024AMG C63 S 2024AMG E53 4MATIC+ 2024AMG E63 S 2024AMG EQS 53 2024AMG S63 E 2024C300 2024C300 4MATIC 2024E350 4MATIC 2024E450 4MATIC 2024EQS 450+ 2024EQS 580 4MATIC 2024Maybach S580 2024S500 4MATIC 2024S580 4MATIC 2024W223
Likely Causes
  1. Deteriorated or cracked fuel cap gasket
  2. Small crack in an EVAP system hose or connection
  3. Faulty EVAP vent valve
  4. Leaking purge valve allowing small amount of vapor escape
  5. Hairline crack in the charcoal canister
How to Fix It
1
Replace the fuel cap and clear the code to see if it returns
2
Perform a detailed smoke test on the EVAP system at low pressure
3
Inspect all EVAP system hose connections and clamps for tightness
4
Test the EVAP vent valve and purge valve for proper sealing
5
Check the charcoal canister for hairline cracks
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Fuel cap
EVAP vent valve
EVAP purge valve
EVAP hoses
Related Error Codes
P0171P0174P0300P0410P0420
Video Guides
Loading video guides…
Search more on YouTube →