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2010 DTS
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No, the EVAP system takes gas vapors from the tank, stores them in a charcoal canister when the engine is shut down and burns them when running. It is part of the emission control system (gas vapors in the air, ozone, yada yada yada). The first thing to check is the gas cap. If it is loose or not sealing properly it will trigger a DTC. There is also an EVAP purge valve and control solenoid, probably on the rear cam cover that controls the system. Check all the vacuum hoses and electrical connections.
 
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