Can anyone tell me why my 1998 4.2 deisel landcruiser auto , drops from "N" to "L" about 25mins after i begin my journey, when it has a full load on board. If i empty the car, leave the engine running for about 10 mins, it will return to "N" but again will drop to "L" when loaded. The guys at the toyota garage in canterbury kent said it was the sensors but how can all four go at once? I know im a only a lady that rides horses and no mechanic but it seems to me like something is leaking somewhere and it cant keep the hydraulic pressure high enough for long. I rather suspect my local garage was going to change all the sensors in the hope to cure it, but very much at my expense!!!!!! can anyone help? 
