MERCEDES-BENZ Code P0442 : Meaning, Causes, and Symptoms | EN
P0442 MERCEDES-BENZ – Understanding the Evaporative Emission System Leak Detected (Small Leak)
P0442 MERCEDES-BENZ Possible Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible noticeable fuel odor caused by the release of fuel vapors
P0442 MERCEDES-BENZ Possible Causes:
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0442 MERCEDES-BENZ Description: The Engine Control Module (ECM) undergoes thorough testing of the Evaporative Emission (EVAP) system, checking for various conditions such as large and small leaks, excess vacuum, purge flow during non-commanded conditions, and faults in Fuel Level and Fuel Pressure sensors, EVAP Purge, and Vent Valve. The ECM continuously monitors the Fuel Tank Pressure sensor to gauge the vacuum/pressure levels in the EVAP system.
When conditions are met, the ECM activates both the EVAP Purge Solenoid and the EVAP Vent Valve to apply engine vacuum to the EVAP system. Once a predetermined level of vacuum is reached, the ECM deactivates the EVAP Purge Solenoid. This test ensures the EVAP system can attain the required vacuum, and failure to do so may indicate a large leak or a restriction.
DonosHome OBD2 Scanner's DTC Lookup Function Operation: To query Diagnostic Trouble Codes (DTCs) using the DonosHome OBD2 Scanner's Lookup function, follow these steps:
- Navigate to the Main Menu and select "DTC Lookup."
- Press OK to proceed.
- Use the right and left arrow keys to change input and the up and down arrow keys to change values.
- Press OK to confirm your selection.
- The meaning of the code will be displayed, providing specific definitions for the identified DTC.
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