What is the reason why the Focus does not move in reverse gear?

[LeCourtney]

The reason why the Focus does not move in reverse gear may be due to operational errors or the synchronizer in the transmission being stuck. Below is an introduction to reverse gear: Gear introduction: Reverse gear is a driving gear available in all cars, usually marked with a capital letter R. After engaging reverse gear, the vehicle's direction of travel will be opposite to that of the forward gear, enabling the car to move backward. When the driver moves the gear lever to the reverse position, the direction of the engine's power input remains unchanged, while the reverse output gear inside the transmission connects with the output shaft, driving the output shaft to rotate in the opposite direction, ultimately causing the wheels to rotate backward for reversing. In manual transmission models with five forward gears, the reverse gear is usually located behind the fifth gear, equivalent to the position of a "sixth" gear; some are set in an independent gear area, commonly seen in models with more than six forward gears; others are placed directly below the first gear, requiring the gear lever to be pressed down one layer to move below the original first gear position, such as in older Jetta models. Main purpose: The function of reverse gear is simple and singular—it allows the vehicle to move in the opposite direction, enabling backward movement. However, this function is indispensable for any car. In manual transmission models, reverse gear also has a hill-holding function. When parking on a downhill slope, the drive shaft can be mechanically locked by engaging reverse gear.