9.5 Obstacles...............................................................................................................142
9.5.1 Noise on bumper......................................................................................142
10.1.4 Using the app......................................................................................... 160
11.1 Maintenance........................................................................................................ 162
11.2 Service.................................................................................................................168
12 Repair.............................................................................................. 189
12.1 Electric circuitry................................................................................................... 189
12.2 Replace sonar..................................................................................................... 189