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In a 2015 VW Jetta, the EVAP canister, also known as the purge valve, can be found to the left of the brake booster and master cylinder on the driver side firewall. This canister, filled with activated charcoal, traps emissions from your car for a cleaner environment and healthier cabin air. A failed canister can cause a fuel or rotten egg smell inside the car, posing health risks and potential emissions test failure, leading to a ticket. If you detect such odors or receive an error code, it's important to bring your car to a mechanic for inspection.
The purge valve in the 2015 Volkswagen Jetta could possibly be found inside the evap canister positioned above the rear muffler.