My remote start has suddenly stopped working! Have I done something wrong? Is there something I can do to make it work?

Check the blue light behind the rear view mirror and if it is on steady (instead of flashing) this means the automatic car start is in valet mode (due to holding a button down for too long or pressing two buttons at once). To get the vehicle out of valet mode put the key in the ignition and  turn it back and forth between the off and on position 5 times within 10 seconds and this should get it reset for you.