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Electronic Noise Squeal Sound Shortly After Starting And Driving


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My LX470 recently started producing a strange electronic sounding squeal noise which is heard within the first minute of driving after the vehicle has sat overnight. I don't know what could be causing this strange electronic sound which is heard quite loudly both inside on outside the vehicle. The sound is like a long eeeeeeeeeeeeeee! sound lasting about two to three seconds before it stops and its not heard again until the vehicle sits overnight and is restarted the next morning and its only after the vehicle is driven for 30 to 60 seconds and then eeeeeeeeeeee!

Does anyone have any ideal what could be causing this (besides a family of mice living under my hood) and what the remedy would be so I can inform my Lexus dealer what to look for.

I appreciate your help.



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