Why is 2019 Toyota Humming hours after turned off?

Asked by kamijob Dec 31, 2020 at 12:28 AM about the 2019 Toyota Highlander Limited AWD

Question type: General

Last night we heard a humming sound in the garage. Upon further
investigation, it was m 2019 Toyota Highlander Hybrid. Started it and it
stopped. Turned it off, and it was gone. Anybody have an answer?

1 Answer
50

Blair answered 3 years ago

I was told by the dealer that this is a normal sound. It is some sort of fuel system canister being purged. Turning on the ignition terminate the purge cycle.

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