Near the starter on the exhaust header. If it is 1990 it will be fun to break the rusty sensor out of the truck. good luck
The speed sensor is mounted in the top of the rear differential on a 1999 F150. Remove the wires, then unbolt the sensor to remove it.
The vehicle speed sensor is on the transmission. The ABS speed sensor is on the differential.
An auto xray scanner can determine if a O2 sensor is bad.
Just downstream after the exhaust manifold
engine light comes on and off. when light is on it hesitates and transmission slips. what could cause that on a 93 F150
Usually in the exhaust pipes coming off the manifolds
drivers side of engine , downstream from catalytic converter
www.motorcraft.com doesn't list an air mass sensor ( MAF ) on the F150 until the 1994 model year
Most oxygen sensors are in the exhaust pipe....between the exhaust manifold and the catalytic converter.
The sensor can be checked for resistance with an ohm meter. The sensor can be checked while cold then hot for resistance change.
They are located on the passenger side. Sensor1 is right past the exhaust manifold, and sensor 2 is after the cat.
OOPS! The cam sensor is on the front of the head, where it's safe and where you can change it easily !