1. Check the transfer case: The transfer case is the component that transfers power from the transmission to the front and rear wheels. If it is stuck in 4WD, it may be due to a mechanical issue or a problem with the electronic controls. Look under the vehicle and try to identify the transfer case. It is usually located near the center of the vehicle, between the transmission and the front axle. If you see any leaks or damage to the transfer case, it may need to be repaired or replaced.
2. Check the linkage: The linkage is what connects the transfer case to the 4WD selector lever inside the vehicle. If the linkage is damaged or disconnected, it may not be able to engage or disengage 4WD properly. Check the linkage for any loose or broken parts. If you find any damage, it will need to be repaired or replaced.
3. Check the vacuum system: Some Land Rovers use a vacuum system to engage and disengage 4WD. If the vacuum system is not working properly, it may not be able to pull the transfer case into 4WD. Check the vacuum lines and vacuum reservoir for any leaks or damage. If you find any leaks, they will need to be repaired.
4. Check the electrical system: Some Land Rovers use electrical solenoids to engage and disengage 4WD. If the electrical system is not working properly, it may not be able to energize the solenoids. Check the wiring harness and fuses for any damage or corrosion. If you find any damage, it will need to be repaired or replaced.
If you are still unable to resolve the issue, it is best to have a qualified mechanic take a look at the vehicle.
