What happened to the sudden closure of Ford Explorer's four off-road modes?

The limited off-road mode of automobiles may be caused by the following reasons:

1, there is carbon deposit on the throttle.

2. The rear differential is faulty.

3, gearbox failure.

Cause of failure 1: There is carbon deposit on the throttle.

The maintenance technician can confirm the fault by removing the engine protective cover, intake pipe and throttle valve and checking whether there is carbon deposit on the surface of throttle valve. If there is carbon deposit on the accelerator, the engine will not work well, and then the off-road mode cannot be used.

Solution 1: cleaning the accelerator, the cost of the 4S shop is about 400-600 yuan, and the cost of the repair shop is about 300-400 yuan, so the owner needs to pay for it.

Reason 2: The rear differential is faulty.

The maintenance technician reads the data flow of the rear differential with the special detection computer for automobiles to analyze whether it can work normally; The maintenance technician lifts the car with a crane to observe whether the rear differential is worn, so that the fault can be confirmed. If the rear differential fails, the rear wheel drive function will not be available, which will further limit the off-road mode function.

Solution 2: Replace the rear differential, and the 4S shop will replace it free of charge during the warranty period. If the insurance is out, the replacement cost of the 4S shop is about 50,000-60,000 yuan, and the replacement cost of the repair shop is about 40,000-50,000 yuan.