no it won't the 2000 has diffrent plugs by the dip stick its a
six pin . i made that mistake and got a 99 at trans for my 2000 and
notice its the same in a accent 97-99 and the elantra but change in
2000 hope this helps
The O2 sensor on a 2000 Hyundai Elantra is removed by
disconnecting the wiring harness and unscrewing the sensor from its
housing. It can then be removed from the vehicle, inspected, and
replaced if needed.