You're hearing the evap canister purge valve (more specifically, the solenoid that opens and closes that valve.) It's part of the emissions system. It's purpose is to allow fuel vapors to enter the evaporative canister, condensate back into liquid, and be returned to the fuel tank. It's often active in warm weather after you shut off the engine.
2018 Sienna Noise After Shut Off
I have a 18’ Sienna that just started making a noise when I shut the vehicle off. The closest thing i can describe it to is like someone tried to pass gas quietly but it ended up being louder than expected. Once its off, it almost sounds like air is being released from a hose or valve. Its hard to tell if its coming from under the air intake (in the back) or if its coming from the front. Can anyone help identify this problem?
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No need to replace anything -- it's normal operation!
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