Why will a toyota rav 4 car go into forward gears and not into a reverse gear?

A Toyota RAV4 may go into forward gears but not reverse due to several potential issues, such as a faulty transmission linkage, low Transmission Fluid levels, or internal transmission problems like worn gears or a malfunctioning reverse solenoid. Additionally, electronic issues or sensor failures in modern vehicles could prevent the reverse gear from engaging. It's essential to diagnose the issue with a professional mechanic for accurate troubleshooting and repairs.