This code means the car's computer has detected a significant leak in the evaporative emission (EVAP) system. The EVAP system is responsible for capturing fuel vapors that escape from the fuel tank and routing them to be burned in the engine, preventing them from being released into the atmosphere.
A large leak could be due to several things, including:
* Gas cap: The most common cause. A loose or damaged gas cap is a major source of leaks. Try tightening the gas cap first.
* Loose or damaged EVAP hoses: These hoses can become cracked, brittle, or disconnected over time. Inspection of the hoses is necessary.
* Faulty purge valve: This valve controls the flow of fuel vapors from the tank to the engine. A malfunctioning purge valve can cause leaks.
* Leaks in the fuel tank itself: This is less common but possible. A small hole or crack in the tank could lead to a large leak.
* Charcoal canister: The canister stores the fuel vapors. A damaged or clogged canister could contribute to the problem.
To properly diagnose the problem, a mechanic will likely use a smoke machine to pressurize the EVAP system and pinpoint the exact location of the leak. Simply replacing parts without finding the leak is unlikely to solve the problem and will waste money.
