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Not Always, On A few nissans, I have found that the problem was actually the harness and not the sensor. This may save you a bit of money!
disconnect the sensor from the wiring harness, removed the screw holding the sensor on, remove/replace and re-secure the screw and reconnect the wires.
it's located under the intake manifold. the knock sensor is most likely ok' the porblem is the short wiring harness from sensor to main wire harness.
WIRING DIAGRAMS TOYOTA WIRING DIAGRAMS TOYOTA
you pull out the fram around the cluster then there are 2 screws you unscrew them and unhook from the wiring harness
The C115 sensor is located right above the wiring harness in a green clip.
Remove the wiring harness from the EGR temperature sensor. Remove the two retaining screws from the sensor. Reverse the process to install the new sensor.
To change an O2 sensor you need to disconnect the wiring harness from the sensor. Use an O2 sensor socket and ratchet set to remove the old sensor and replace with the new one.
You can replace the radio, on your 1996 Toyota, I removing the radio front cover. Remove the retaining screws. Unplug the wiring harness. Reverse the process to install the new radio.
This is procedure of easy difficulty to remove and replace. This application has stand-alone oil pressure sensor. The first step is disconnecting its attached wiring harness. The sensor can then be unscrewed with a wrench flat. The replacement new oil pressure sensor can then be screwed in and wiring harness reattached.
The speed sensor can be found on the side of the transmission and can be easily removed with a 9/16 ratchet. Remove the wiring harness from the speed sensor before removing the speed sensor from the transmission.
Pretty sure it has an electronic speed sensor which means it doesnt have a cable but instead it plugs into the wiring harness.