1. Brake Pedal/Brake Switch:
* Problem: The brake pedal switch might be faulty, not making proper contact, or have a broken wire. The system needs to detect brake pedal pressure to release the shift interlock.
* Troubleshooting: Check the brake lights. If they don't work, the brake switch is highly suspect. You might need a new brake light switch (relatively inexpensive and easy to replace, but requires some basic mechanical skills). Sometimes a simple cleaning of the switch contacts can resolve the issue.
* Fix: Replace the brake light switch.
2. Shift Interlock Cable/Mechanism:
* Problem: The cable connecting the shifter to the interlock mechanism might be broken, stretched, or disconnected. The mechanism itself might be jammed or worn.
* Troubleshooting: This requires a visual inspection of the linkage under the dash (which can be difficult and requires removing some parts). You might see a disconnected or frayed cable.
* Fix: Repair or replace the cable or the interlock mechanism. This is usually a more involved repair, possibly requiring professional assistance.
3. Low Transmission Fluid:
* Problem: While less likely to directly prevent shifting out of park, critically low transmission fluid can cause various issues, including electrical problems that affect the shift interlock.
* Troubleshooting: Check the transmission fluid level using the dipstick. If it's low, add fluid of the correct type (consult your owner's manual). Low fluid points to a much larger issue and should not be ignored.
* Fix: Add transmission fluid. If the level is consistently low, there's a leak and that needs to be addressed.
4. Faulty Shift Lever:
* Problem: The shift lever itself could be malfunctioning, preventing it from properly engaging the mechanism. This is less common.
* Troubleshooting: Difficult to diagnose without mechanical expertise.
* Fix: Replacement of the shift lever might be necessary, usually a more involved repair.
5. Electrical Issues:
* Problem: A problem with the car's electrical system could affect the shift interlock. This could be a blown fuse, a faulty relay, or a more complex electrical fault.
* Troubleshooting: Check fuses related to the transmission and the shift interlock system (consult your owner's manual).
* Fix: Replace faulty fuses or relays. Further investigation may be needed for more complex electrical issues.
Important Considerations:
* Safety: If you are not comfortable working on your car's electrical or mechanical systems, it's best to take it to a qualified mechanic. Working on the shift interlock improperly can create safety hazards.
* Owner's Manual: Always consult your owner's manual for specific details on your Ford Taurus model and year. It might contain troubleshooting tips and diagrams.
Before attempting any repairs:
1. Check your owner's manual.
2. Verify the brake lights are working. This is the easiest way to narrow down the problem.
3. Check the transmission fluid level.
If you've checked these and the problem persists, it's advisable to seek professional assistance from a mechanic. They possess the tools, expertise, and knowledge to diagnose and safely repair the issue.
