What's the reason for suddenly being unable to engage 5th gear and reverse gear while driving?

[JadeRose]

Adjustment of the gear lever mechanism is required. Generally, it's caused by worn rubber bushings and excessive clearance due to prolonged use, leading to gear engagement failure. It's recommended to visit a professional repair station for maintenance. Relevant explanations are as follows: 1. Clutch cable failure: Manual transmission vehicles use cables to control the clutch. The outer sheath of the cable can easily crack, resulting in no clutch and difficulty in gear shifting. Simply replace the cable. 2. Excessive self-locking force of the clutch gear: This makes it difficult to engage or disengage gears. It's advised to go to a repair shop to adjust the clutch cable and gear lock. 3. Clutch master cylinder failure: The clutch hydraulic master cylinder may experience pressure loss or oil leakage during use, causing gear engagement failure when pressing the clutch. Visit a repair station to replace the clutch master cylinder, and perform an air bleeding operation after replacement.