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In a 2011 VW Jetta, the purge valve is located between the exhaust and the intake manifold of the vehicle. Its purpose is to open and allow exhaust gases to re-enter the engine for combustion before being expelled into the environment through the exhaust system. If this valve malfunctions, a check engine light will typically illuminate on your dashboard, indicating an issue with the emissions system. It's important to inspect the valve to ensure it is not stuck in either the open or closed position, as this could disrupt the flow of gases back into the engine, resulting in rough running or potential stalling while driving.
The 2011 VW Jetta's evap canister, also called the purge valve, can be found positioned behind the muffler towards the back of the car.