Hi. Can anyone offer us any ideas as to what might be wrong with our 52 plate Audi TT xenon headlight please? We have had this problem for a long while, and despite several trips to the garage, it is still not fixed. The off side headlight sometimes refuses to light up. If it does come on, it will stay on all day. If it does not light, it will be off all day. Turning the lights off and on can make it light up. There is an 'bulb failed' light in the dash on the occasions that it fails to light, but their is no error logged in the cars's ecu. The garages (Audi maindealer and independant specialist) have swapped the bulbs over. We have also had a new transformer fitted (at great expense) but still got the problem. It seems that the garages are at a loss to to know what to do if there is no error messages telling them