1. Vehicle Speed Sensor (VSS): This is the most likely sensor you need to replace if you're having speedometer or transmission issues. It's usually located on the transmission itself. You'll likely need to get under the vehicle to access it.
* Location: It's typically mounted on the top or side of the transmission, near the output shaft. It may be a single-wire sensor or have multiple wires. A wiring harness connector will plug into it. There's no single definitive visual description as its appearance can vary slightly.
* Finding it: Use a repair manual (Chilton's or Haynes are good options) specific to your 2003 Ford Windstar. The manual will have diagrams showing the exact location and how to access it. Searching online for "2003 Ford Windstar VSS location" with images may also help.
2. ABS Wheel Speed Sensors: These sensors are located within each wheel hub assembly, one sensor per wheel. These are less likely the culprit for general speedometer problems, but would be involved if your ABS light is on or if you're experiencing ABS problems.
* Location: Inside each wheel hub. You'll have to remove the wheel to access them. They are usually small, cylindrical sensors with a single wire.
* Finding them: Again, a repair manual is your best bet. Look for diagrams showing the ABS system components and the sensor locations within the wheel hubs.
Before you start:
* Consult a repair manual: This is crucial. It will provide detailed instructions, diagrams, and torque specifications to avoid damaging your vehicle.
* Disconnect the negative battery terminal: This is a safety precaution to prevent electrical shorts.
* Gather the necessary tools: You'll likely need sockets, wrenches, possibly a jack and jack stands (for working under the car), and possibly a torque wrench.
If you're unsure about any step, it's best to take your Windstar to a qualified mechanic. Replacing the wrong sensor, or damaging something during the replacement, could cause further problems.
