Controversial & Contradictive
My lights come on when I pass under a tunnel of trees on my way to work, even in bright sunlight(I seem to remember!), but often when it is late afternoon and overcast, the lights stay off and I need to manually turn them on. The sensor is in the rear view mirror mounting plate facing out of the front windscreen. I've thought about getting some lightly tinted film to cover the sensor to make it more sensitive.
53 A4 2.5TDi Quattro Sport 180 Tiptronic. Heated Buffalino leather, DVD Sat Nav RNS-E, TV, Bluetooth, 6 cd, BOSE, Colour DIS, Cruise Control, Auto lights and mirrors, Interior light pack, Heated mirrors.