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TacomaGeneral discussion forum for the 2005 and later Toyota Tacoma.
This is a discussion thread titled "What is that noise?", within the Tacoma forum, part of the Truck Forums category.
I have notice more than once, when my truck is shut off sitting in the garage, you can sometimes hear a small motor like sound very faint, like something running. Runs for a minute or two and shuts off,
Anyone know what this is?
It's the OBDII part of the computer running the pump to test the Evap System. Leave your gas cap off some night and see if you have a code in the morning......