I have a 2015 model Toyota Vitz. I changed the transmission fluid at 64,000 KM, and now the mileage is 109,000 KM. Recently, I have started experiencing an issue with the gear. When I shift to "R" (Reverse), the car moves backward but then stops abruptly with a loud noise. If I accelerate more, the car moves very slowly in reverse. However, the car runs perfectly fine in "D" (Drive); only the reverse gear is causing trouble.
This issue also happened a week ago. I took it to a mechanic, and he said the gear would need to be replaced. But then, the problem disappeared on its own. The mechanic checked the shifter and everything, but there was no fault. Now, after a week, the issue has started again.