P0442 MERCEDES-BENZ - Evaporative Emission Control System Leak Detected Small Leak
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
First diagnose P0442 MERCEDES-BENZ code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0442 MERCEDES-BENZ Tech NotesThe P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0442 code.
Cost of diagnosing the P0442 MERCEDES-BENZ code
Labor: 1.0The cost of diagnosing the P0442 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0442 MERCEDES-BENZ code detected?Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.
P0442 MERCEDES-BENZ Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0442 Mercedes-benz DescriptionThe Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
P0442 MERCEDES-BENZ More InformationNeed more information on how to fix the P0442 MERCEDES-BENZ code?
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Need more help?Get the P0442 Mercedes-benz code diagnosed by a professional: Find a repair shop in your area
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