The EVAP system prevents fuel vapors from escaping into the atmosphere. This code means the onboard diagnostics (OBD-II) system has detected a leak, likely somewhere between the fuel tank and the charcoal canister (or other components within the system).
Possible causes of P0442 in a 2002 Durango include:
* Loose or damaged gas cap: This is the most common and easiest to check first. Ensure the gas cap is tightly sealed and not damaged.
* Leaking fuel tank: A crack or hole in the tank itself.
* Problem with the purge valve: This valve controls the flow of fuel vapors.
* Faulty vent valve: Another valve that allows air into the system.
* Leaks in the EVAP hoses or lines: These hoses can become cracked, brittle, or disconnected over time.
* Faulty charcoal canister: The canister absorbs fuel vapors. A clogged or damaged canister can cause this code.
* Sensor issues: While less common, a faulty EVAP sensor could trigger this code.
Troubleshooting:
1. Check the gas cap: This is the simplest and cheapest fix. Tighten it securely. If it's damaged, replace it. Sometimes clearing the code after replacing the gas cap is sufficient.
2. Visual inspection: Carefully examine all EVAP system hoses and lines for cracks, holes, or loose connections.
3. Smoke test: A specialized smoke test can help pinpoint the exact location of a leak within the EVAP system. This usually requires a mechanic.
4. OBD-II scan tool: A more advanced scan tool might provide more specific information about the location of the leak.
If you're not comfortable performing these checks yourself, take your Durango to a qualified mechanic for diagnosis and repair. Ignoring this code could result in failing emissions testing and potentially harming the environment.
