Hi all,    Had a towbar fitted by the dealer on Monday and since then I've noticed that when I put the car into reverse the rear traffic alert and blind spot monitor says there's a fault and it turns them off. It let's me turn them back on but turns them off again when I put it back in reverse.    Any ideas why it would do that? It doesn't do it every time tho maybe once in 4 times of putting it into reverse.    Thanks  James