1. Faulty Transfer Case Shift Mechanism: The transfer case shift mechanism may be damaged or malfunctioning, preventing it from disengaging from 4 wheel drive. Inspect the shift linkage and ensure it is properly connected and not damaged. If necessary, replace the faulty components.
2. Vacuum Issues: The Loyale uses vacuum to engage and disengage the 4 wheel drive. Check the vacuum lines and connections for any leaks or damage. Repair or replace any faulty vacuum lines.
3. Faulty Vacuum Switch: The vacuum switch controls the vacuum flow to the transfer case. Test the vacuum switch to see if it is functioning properly. If it is faulty, replace it.
4. Faulty Solenoid: The solenoid controls the vacuum flow to the transfer case. Check the solenoid for proper function and replace it if necessary.
5. Faulty Front Axle Disconnect: The front axle disconnect may be malfunctioning, preventing the front wheels from disengaging from the drivetrain. Inspect the front axle disconnect mechanism for damage or wear, and repair or replace as needed.
6. Transfer Case Fluid: Low or contaminated transfer case fluid can cause issues with shifting in and out of 4 wheel drive. Check the transfer case fluid level and condition and change it if necessary.
If you are not comfortable performing these checks and repairs yourself, it is recommended to take your vehicle to a qualified mechanic or Subaru dealership to diagnose and fix the issue.
