* Car won't start: This is the primary symptom. The engine cranks, but it won't fire. This happens because the switch isn't signaling to the starter that the transmission is in Park or Neutral.
* Intermittent starting problems: Sometimes it starts, sometimes it doesn't. This points to a problem with the switch itself, which might be failing intermittently.
* Shifting problems (less common but possible): While less directly related, a faulty neutral safety switch *might* contribute to erratic shifting behavior, particularly if it's also impacting the transmission's control system. This is less likely than the starting issues.
* Check Engine Light (less common): A severely malfunctioning switch *might* trigger a check engine light, but this is not always the case. The code read from the computer would be necessary to confirm if the issue stems from the neutral safety switch.
How to differentiate from other starting problems:
It's crucial to distinguish a bad neutral safety switch from other starting issues. If you have a bad battery, starter, or ignition system, the car may not crank at all, or the cranking may be weak. A bad neutral safety switch usually results in normal cranking but no ignition.
Testing (proceed with caution - working with car electrical systems can be dangerous):
While a professional mechanic should ideally diagnose the problem, a basic test can be done with caution:
1. Check the Transmission Position: Make absolutely sure the gear selector is firmly in Park (P) or Neutral (N).
2. Wiggle the Shift Lever: Gently wiggle the gear shift lever while trying to start the car. If the car starts intermittently while moving the lever, the switch is likely the culprit. This is a basic test for a loose or failing connection.
3. (Advanced - Use with caution): With the key OFF, carefully use a multimeter to test the continuity of the neutral safety switch wires. This requires understanding electrical circuits and proper safety precautions. You'll need a wiring diagram to identify the correct wires. Improper testing can damage your car's electrical system.
If you're not comfortable with car repair, take your Taurus or Sable to a mechanic. Misdiagnosis and improper repair can lead to further damage and expense. They have the tools and expertise to diagnose the problem correctly and replace the switch if necessary.
