It is a small (usually white) plastic sensor attached to the top of the EGR valve.
The 1994 Ford F1 50 crankshaft sensor is located on the back of the engine. You will need to remove the rear engine cover in order to access the crankshaft sensor.
The vehicle speed sensor (vss) is generally located at the rear of the transmission.
The 1994 S10 uses a MAP sensor, not a MAF sensor. We need to know size engine you have in that S10.
The speed sensor on a 1994 Honda Civic is located on top the of the transmission. To replace it unplug the sensor from the wire harness then the remove mounting bolts and assembly from the transmission.
the oxygen sensor in located in the exhaust manifold under the intake manifold at the back of the engine
The temperature sensor on a 1994 Rodeo 3.2 liter is located on the back of the engine. You need to remove the manifold to access the sensor.
On the throttle body.
On a 1994 Ford Explorer : The Mass Air Flow sensor is located between the top section of the engine air filter housing and the engine air intake tube
The coolant temp sensor is located directly under the EGR valve, just in back of the upper radiator hose connection on the engine. The sensor has 2 wires and uses a 14mm socket to replace
On the intake housing.
The 1994 Chevy 454 cubic inch big block engine temperature sensor is located on the front of the engine. The engine temperature sensor will be a few inches above the thermostat housing.
There are many sensors on the engine, need to know which one you are looking for.