P0442

What it means

This code indicates that your car's computer has found a minor leak in the system designed to prevent fuel vapors from escaping, often caused by a loose gas cap or a small crack in a hose.

Is it safe to drive?

Driving with a P0442 code is generally safe as it doesn't typically affect vehicle operation. However, it's an emissions issue that should be fixed to pass inspections and prevent environmental pollution.

Most likely causes

• Loose, missing, or faulty gas cap

  high

  A gas cap that isn't sealing properly is the most common culprit for small EVAP leaks.

• Cracked or disconnected EVAP hose

  medium

  Inspect all EVAP hoses for small cracks, chafing, or loose connections.

• Faulty EVAP purge valve or vent valve

  medium

  These valves can fail to seal completely, allowing a small amount of vapor to escape.

• Leak in the charcoal canister or its seals

  low

  The charcoal canister can develop cracks or its seals can degrade over time.

Related help

• Full P0442 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?