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Hours after parking my CT in the garage (2012, recertified after a lease, I've owned it for two weeks), I heard a buzzing sound. Couldn't figure what it was for the life of me. Google suggests it was the gas vapor purge pump.

Buzzing sound when engine is off - Club Lexus Forums
It's 100% normal. If you do a search on the forum you'll find that many new owners always post this wondering what it is. Hybrids make a lot of weird noises even when turned off.


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