I have almost 150K miles on my 2001 Prius. I have noticed that starting about 2 weeks ago the car makes a really loud whining noise when I accelerate. It gets loudest when I am traveling at 47-49 mph and then becomes a bit quieter at higher speeds. It seems to be coming from the engine. I had the oil changed and the emissions/safety test done last week. It is still as loud as ever. Any ideas about what could be causing this noise? :blink: Thanks!