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The speed sensor on a 2001 Toyota 4Runner can be found near the front bottom of the transmission. To remove it, you'll need a 1-inch deep well socket. Its main job is to calculate the transmission's gear ratio while the vehicle is in motion. There are actually two sensors - one to monitor the input shaft speed and another for the output speed. Signs of a faulty sensor include hesitation, sporadic shifting, or rough gear changes in the transmission, as well as possible speedometer issues. If the speed sensor is failing, you may also experience problems with the cruise control not working. The average cost to replace the speed sensor in a 2001 4Runner ranges from $290 to $400, with labor typically accounting for $70 to $90 of that cost.
The speed sensor for a 2001 Toyota 4Runner is located on the right side of the transmission.