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What are some possible reasons for a Toyota 4Runner to make a loud, high-pitched sound?
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★ Top Answer
Unidentified noises can be quite amusing, but unfortunately, I can't pinpoint one specific cause for the high-pitched noise you're hearing in your Toyota 4Runner. For instance, if it's a screeching noise, it might be the serpentine belt. If it's a constant whining noise, it could be "alternator whine" which may sound like it's coming from the radio. Another possibility, especially if you hear it with the brakes applied, is something touching the rotors, even something as small as a dry leaf stem. I recommend starting by checking all your fluids and visually examining your brakes and belts for any obstructions.
More answers
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I drive a 2006 car with 175k miles on it. Lately, I noticed a grinding noise like a brake pad was worn down, and then today a loud high-pitched noise started and my brakes completely failed. I tried turning off all electrical systems but the noise persisted until I shut off the car. Do you think there's some kind of emergency warning system that activated? I've been driving Toyotas for 4 decades and this was a first for me.
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Typically, if you hear a loud squealing noise coming from a Toyota 4Runner, it's a sign of a problem with the battery or alternator.
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