I hear a humming noise coming from the rear of the car while I am driving.
A humming noise is typically caused by loose exhaust components or possibly road debris that was run over and caught in the undercarriage of the vehicle. A test drive of the vehicle will be needed to determine where the sound is coming from. If you need further assistance with this, a qualified technician, such as one from YourMechanic, can visit your home or office in order to make an accurate diagnosis of the noise.
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