2004 Audi A4 QUATTro 1.8t headlights won't turn off

SOURCE: Audi A4 "left dipped headlight" problem

AUDI A4- 2005. There is a technical service bulletin for this exact problem. take it to the dealer when this issue has happened while driving. During a daytime drive when cold see if you cant get the light to fail while circling your dealer. As soon as you pull into the service drive do not turn the car off do not flip the switch. I am an Audi Technician for a dealer in Birmingham alabama. Personally this is not my favorite repair to perform; What audi states is that if the bulb flickers the bulb should be replaced; if one side fails the bulb should be swapped left to right if the fault continues with the bulb the bulb is at fault; if the bulb is swapped and the bulb fails again on the same side it is the module. NOW: I currently am working on a 05 A4 that both bulbs both modules have been replaced and Audi has no clue what to advise on a repair. THIS IS AN ISSUE if it has happened to you ask if there is a TSB for this issue or try to find it for yourself.

SOURCE: Audi A4 "left dipped headlight" problem

Hi,I dont know if your Audi has the same problems as SAAB and VW but they suffer from what is called a dry joint on the circuit board inside the headlamp control relay,what happens is as the board heats up it causes expansion/contraction on the bad solder joint causing all sorts of component failures headlamps just being one of them,remove the relay and open it and on close inspection you will find the (dry joint/s) if your handy with a soldering iron a fraction of the price of some of these relays,you can re-melt the solder on the bad joints to cure the problem.

SOURCE: no running daytime running lights or side lights

i had a similar problem with my 97 a4 2.8. i changed my daytime running lights relay and it solved the problem. its located under the steering wheel behind the knee bolster

SOURCE: jetta headlights not working

Ignition switch will cause you to loose your head lights and turn signals. You will still be able to start the car and hold the switch for your brights but normal function is gone. Check it out it usually only runs about $20-$30 for replacement part but you need a special puller to get to it.

SOURCE: Audi A4 "left dipped headlight" problem

I have the same issue on my 2002 A4. According to my Audi dealer mechanic, there is a sensor on the front suspension that controls the angle of the headlight. Replacing this may resolve the issue.