I needed to change the 8 engine water caps, I took my car to the nearest workshop and have them done. In the same day I drove the car away and after one hour when I stopped the car and started again the automatic gearbox stopped functioning neither drive nor reverse. I called up the workshop technician, he came over added 2 liters of gearbox oil and checked the right wheel transmission shaft and it's ball joints, yet he couldn't solve the problem. I towed my car home and don't know what to do. If anyone can help I'll be very grateful.