CAUTION: Some models are equipped with anti-theft-radio make sure you have the activation code before disconnecting battery
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If the VSS is defective replace the instrument cluster.
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I believe it is a input speed sensor. Hyundai calls them pulse generators on the 99 elantra.
Front right side
1-3-4-2
You can probably find that out from your VIN number.
Its going to be under the dash beside the gas pedal
If the VSS is defective replace the instrument cluster.
Your speed sensor might be broken. Check it for rust or broken plastic part that would let water get in. Usually means you need to replace.
It between the firewall and back of engine, under the overhang portion of the intake manifold.
Defective PW motor, short in the wiring or the switch.