3. When reversing, I get a continuous beep, even when I'm not close to anything, which I don't think is right. Isn't it supposed to beep beep beep until I get close to something?
There is a fairly quiet beep on the 4200 When you have selected reverse even without parking sensors fitted. Sounds like an old digital watch alarm going off to remind you your in reverse. It not a continious beep. Its not the reverse alarm your hearing if its a continious tone.