Before you begin:
* Consult a repair manual: A Haynes or Chilton manual specific to your 1998 Ford Taurus will provide detailed diagrams and instructions. This is crucial for success.
* Gather tools: You'll need basic hand tools including sockets, wrenches, a ratchet, possibly a jack and jack stands (essential for safety), and potentially a torque wrench for proper tightening.
* Safety first: Work in a well-ventilated area. Always use jack stands to support the vehicle – never rely on a jack alone. Wear safety glasses.
General Procedure (This is a general outline, your repair manual will be much more specific):
1. Prepare the vehicle: Securely jack up the vehicle and place it on jack stands. Consult your repair manual for the proper jacking points. Disconnect the negative battery terminal.
2. Locate the speed sensor: The speed sensor's location varies slightly depending on the transmission type (there are a few variations for the 3.0L V6 in '98). Your repair manual will show you the exact location. It's typically found on the transmission case, near the output shaft. It might be a small, cylindrical sensor with a single wire connector.
3. Disconnect the electrical connector: Carefully unplug the electrical connector from the speed sensor.
4. Remove the speed sensor: The sensor is usually held in place by a bolt or retaining clip. Use the appropriate socket or wrench to remove it. Sometimes it's a bit stubborn and may require some gentle persuasion (penetrating oil can help). Be careful not to damage the sensor's threads or the transmission case.
5. Install the new speed sensor: Carefully install the new speed sensor, ensuring it's seated correctly. Tighten the bolt or clip to the manufacturer's specified torque (find this in your repair manual).
6. Reconnect the electrical connector: Plug the electrical connector back onto the new speed sensor.
7. Lower the vehicle: Carefully lower the vehicle from the jack stands.
8. Test the speedometer: Start the engine and check if the speedometer is working correctly. If not, double-check all connections and ensure the new sensor is properly installed. A scan tool might be needed to diagnose any codes.
Important Considerations:
* Transmission fluid: There's a small chance of a fluid leak during this process. Have some transmission fluid on hand in case you need to top it off. However, a significant leak indicates a larger problem.
* Torque specifications: Using the correct torque when tightening the sensor is essential to prevent damage. Use a torque wrench if possible.
* ABS sensor: Be aware that there's also an ABS speed sensor on the transmission. Make sure you're replacing the correct sensor. The ABS sensor is usually a different shape and location than the vehicle speed sensor.
* Professional help: If you are uncomfortable with any step of this process, take your vehicle to a qualified mechanic.
This is a simplified guide. Always refer to a repair manual specific to your 1998 Ford Taurus 3.0L V6 automatic transmission for detailed instructions and diagrams. Failure to do so could lead to damage or injury.
