How to Replace Camshaft Position Sensor 03-09 Toyota 4Runner

Difficulty: Beginner · About 30 min · Toyota 4runner

Replace the camshaft position sensor on a 2003–2009 Toyota 4Runner and secure the engine cover after verifying the connection.

Steps

1. Expose and disconnect the sensor

   With the engine off and cool, remove the engine cover fasteners and lift the cover away. Release the camshaft sensor connector lock and unplug the harness without tugging on the wires.

2. Remove the existing sensor

   Remove the sensor's retaining bolt and pull the sensor straight from its mounting bore. Inspect the connector and opening for oil contamination or debris, and confirm the old seal is not left behind.

3. Install the replacement sensor

   Lubricate the replacement O-ring lightly with clean engine oil, seat the sensor squarely, and install its bolt tightened to the vehicle specification. Plug in the connector until it locks and reinstall the engine cover with its rear hooks aligned first.

4. Verify sensor operation

   Start the engine and check for normal operation and warning lamps. If a fault remains, read the diagnostic code and inspect the harness and connector rather than assuming the new sensor is defective.

Check your vehicle’s repair manual for exact specifications and fit.