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Found 1stChoice spares asked for a search with them and they had nothing so they asked me if they would let me send out my request to some of there breakers they dealt with and they got two replies MGS Automotive LTD **** ECO Auto parts Parts *****

I also will have a repair day tomorrow, Oil Pressure Switch.

So pin 1 is a earth and pins 2 and 3 are live feeds for the bulbs and missing pin 4 is redundant on this model of car, have you check that your getting a feed to each bulb and a continuity check from the earth track to a ground on vehicle chassis

Do ypu have VCDS to read the codes? Any Audi Owner should have this tool. Look it up on the Rosstech site.They have a WIKI there with a lot of information.

Had to fix problems like this before and feel for you, the headlamps on these are quite basic compared to newer generations, you best bet is to buy yourself a power probe, works like a voltmeter but indicates if you have probed a live or earth and what voltage, can check continuity and best of all supply a live or earth feed at touch of a button. take time and probe each wire on the car plug switching headlamps on and off to identify each wires function, typically only 1 earth for complete light, larger lives will be main and dipped lives, indicator live is easy as voltage switches quickly, drl is always live but voltage will drop when indicator is on or dipped beam. headlamp leveling is abit of a pain as looking for change in voltage when car starts as should do a level test but leave that to last and hopefully will only have 2 wires. Responding to old post but hopefully help someone

Proof positive will be by obtaining the VIN, then walking into your local Audi dealer, and asking the Parts section if they would be kind enough to help you out with a copy of the build record. Arm yourself with a box of biscuits to lubricate the assistance. Don’t try to do this over the phone, it seldom works that way.