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Technical Description

Evaporative Emission Control System Leak Detected (small leak)

What does that mean?

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.


You likely won't notice any drivability problems.


A code P0442 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap

  • A non-conforming gas cap (i.e. not factory/original brand)

  • A small leak/hole in a fuel vapor hose/tube

  • Other small leak in EVAP system

  • Faulty vent o-ring seal

Possible Solutions

With a P0442, the most common repair is to:

  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.

  • Otherwise, replace the gas cap, or

  • Inspect the EVAP system for cuts/holes in tubes/hoses


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