How to Replace the Crankshaft Sensor in a Ford F-150

by John Stevens J.D.

The Ford F-150 truck is equipped with a crankshaft sensor that relays important information about the position of the crankshaft to the engine’s computer system. A defective sensor is typically accompanied by difficulty starting the engine when cold, hesitation upon acceleration, poor fuel mileage and a loss of power. Replacing the sensor is a fairly straightforward process, but because the sensor is located behind the air conditioning compressor, the compressor must first be removed from the engine.

Step 1

Insert the square tip of a 1/2-inch socket wrench into the square hole in the center of the serpentine belt’s adjustment pulley. The adjustment pulley is the smallest pulley the belt wraps around.

Step 2

Pull the adjustment pulley toward the engine with the socket wrench to release the tension on the serpentine belt, then pull the belt off the air conditioning compressor’s pulley.

Step 3

Remove the bolts which secure the air conditioning compressor to its mounting brackets with an open-end wrench, then position the compressor to the side of the engine compartment. Do not disturb the hoses that attach to the compressor.

Step 4

Pull the electrical connection off the crankshaft sensor.

Step 5

Remove the two bolts that secure the crankshaft sensor against the engine with an open-end wrench, then slide the sensor out of the engine.

Step 6

Slide the new crankshaft sensor into the engine, then install and tighten the sensor’s two securing bolts with an open-end wrench.

Step 7

Press the electrical connection onto the crankshaft sensor.

Step 8

Position the air conditioning compressor against its mounting brackets, then install and tighten the compressor’s bolts with an open-end wrench.

Pull the serpentine belt’s adjustment pulley toward the engine with the socket wrench, then position the belt onto the air compressor’s pulley.

Items you will need

  • 1/2-inch socket wrench
  • Open-end wrench

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