Unplug the sensor and unscrew it from the exhaust pipe. You'll probably need a special socket to do it without damaging the wires.
The oxygen sensors are in the exhaust pipes on most models.
You don't as it does not have a cable. You replace the speed sensor instead.
The speed sensor is not expensive and is easy to replace.
O2 sensors are always located on the exhaust system.
The heater in the oxygen sensor has failed. Its a good idea to replace BOTH oxygen sensors at the same time. If one has failed the other won't be lasting very long.
There's no need to replace knock sensors, and there was never a 3.6 engine.
the elictronic control sinsor at on a 93 mercury villager
The speed sensor is on the top back corner of the transmission housing. It is held down by one screw.
The cam sensor on a 1996 Mercury Villager cost about $35 to $40. The sensor is actually manufactured by a Nissan subsidiary.
TPS usually means throttle position sensor, and it doesn't have a "cable".
I'm not aware that part was installed on Villagers. It would be on the EGR valve if it was.
the sensor on the 3.3l mucury villager is integrated into the distributor