P0501 - where is the location of the sensor on a 2001 Hyundai Elantra 2.0L?
does your car has ABS? if you dont then its going to be one of those sensors.
if you dont have ABS its going to be the VSS Vehicle speed sensor
did you have any parts replaced on the car? Axle maybe? if so make sure the correct part was used some dont have abs teeth rings
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