Ford F-150/F-250: How to Replace Crankshaft Position Sensor

If you experience problems with your Ford F-150 or Super Duty's performance, you might be looking at a bad crankshaft position sensor. Haynes Manuals shows you how to replace the crankshaft position sensor yourself.

November 21, 2014
Contributors: Haynes Manuals

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Haynes Shows You How

This article applies to the Ford F-150 (2004-2014) and the F-250, F-350 Super Duty (2005-2014).

A crankshaft position sensor sends information about the position of the crankshaft in your Ford F-150 or Super Duty truck to the Powertrain Control Module (PCM). Signs of a bad crankshaft position sensor include problems starting the engine when it’s cold outside, acceleration issues, loss of power, and poor fuel mileage.

On the 4.2L V6 engine, the sensor is located above the crankshaft pulley on the timing chain cover. On 4.6L and 5.4L V8 engines, it's located on the right lower side of the timing chain cover, behind the air conditioning compressor.

Materials Needed

  • Crankshaft position sensor
  • 1/2 inch drive ratchet or breaker bar (V8 models only)
  • Rachet, extension and socket to fit crankshaft position sensor bolt(s)
  • Socket to fit A/C compressor bolts (V8 models only)

Step 1 - Remove the drivebelt (V8 models only)

Push the square drive of a ratchet or breaker bar into the hole at the end of the drivebelt tensioner arm. Rotate the tensioner clockwise to release tension on the belt, then slip the belt off of the air conditioning compressor pulley.

Figure 1. Rotating the drivebelt tensioner (V8 models)

Step 2 - Move compressor out of the way (V8 models only)

Remove the air conditioning compressor mounting bolts and reposition the compressor to the side, supporting it with a length of wire.

WARNING: The air conditioning system is under high pressure. DO NOT detach the refrigerant lines.

Figure 2. A/C compressor mounting bolts

Step 3 - Remove the crankshaft position sensor

Disconnect the electrical connector from the crankshaft position sensor, then remove the bolt(s) and pull the sensor from the engine.

Crankshaft position sensor Ford F-150

Figure 3A. Crankshaft position sensor details for V6 engine.

1) Electrical Connector. 2) Sensor mounting bolts. 3) Crankshaft position sensor

Crankshaft position sensor mounting bolt Ford F-150

Figure 3B. Crankshaft position sensor mounting bolt for V8 engine.

Step 4 - Install the new sensor

Clean the sensor mounting surface, then install the new sensor to the engine. Tighten the mounting fastener(s) to 89 inch-lbs, then reconnect the electrical connector.

Step 5 - Reinstall the a/c compressor (V8 models only)

Place the compressor into position and install the mounting bolts, tightening them to 18 ft-lbs.

Step 6 - Reinstall the drivebelt (V8 models only)

Rotate the tensioner clockwise again and slip the belt onto the air conditioning compressor pulley (and make sure it is properly engaged with all of the other pulleys, too). Slowly release the tensioner and remove the ratchet or breaker bar.

Ford F-150 Drivebelt routing diagram
Figure 4A. Drivebelt routing diagram (V8 models).

Figure 4B. When installing the belt, make sure it is centered on all of the pulleys.

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