Does your Audi A3, MKII TT, or VW MK5 R32 sometimes have erratic misfiring with no check engine light on? Don't worry, it's a common problem, and here is your solution. Here's how it works:

Evaporative purge system performs two important operations. Primary purpose of the system is entrapment of fuel vapor produced in the gas tank in order to ensure cleaner environment. Secondary purpose of the system is provision of ventilation for the gas tank by allowing outside air to enter the tank and take the space left behind by used fuel.

If you purge valve isn't operating properly, gas is getting choked off at the tank. Let the fuel flow freely and keep your charcoal canister clean with this Genuine Audi/VW replacement part. Keeping your EVAP system happy will keep your engine happy.