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My 2011 Prius had a blown head gasket so I went and replaced the engine with used one. You know how it goes. Anyway, after awhile when I'm slowing and coming to a stop, I get a hooting noise coming from under the hood. It quits by the time I open the door and get out. It's been happening for one to two weeks. Now today I get in and it won't start, dash doesn't come on. The door did open, but can't open the hatch, so I can't check the battery. I bought the Battery on 02/02/2020. Any ideas?
 

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I had similar problems with another car (non-Toyota). AutoZone tested my battery and insisted it was good. So did their competition. After a couple of months of grief, I finally replaced the battery. I haven't had a problem since. I would test that battery. Your battery may not have been a long-life battery.
 
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