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use bba but send yours to be rebuilt. it saves on mileage and programming issues.
check local emissions laws. extended coverage may be available for MIL lights not working. in new york its 7 years 70,000 miles. 1) bulb 2) wire 3) engine module 4) inst cluster. i'd try a bulb.
i've used bba before, no problems. might i suggest send YOUR cluster to be refurbished. this saves in programming and mileage issues needing to be addressed.
does the scroll knob work? the button often cracks, becomes loose and will not turn the selector. try with the knob pulled off.
make sure your fans work. does the heater work well? a bad pump will decrease heater funtion too due to low flow. does the car actually overheat? false warning lights can come from the low coolant sensor in the tank or the wiring, and dont get me started on the coolant multi function sensor under the upper radiator hose flange. note: the timing belt drives the water pump, so be careful.
easy as power and ground. get to the motor under the column and test power and ground at the larger of the wires going to the motor. there may be smaller wires for position sensing. if power and ground are ok, the motor is bad. if not, you will need a wiring diagram.
check your previous bill. were there 4 cam seals/plugs charged out? these seals cover the bolts in the cam pulleies that need to be loosened to do a t-belt and should have been replaced. there should also be 2 valve cover gskts since the cams need to be physically held to time the engine. i'd be wondering what else could have leaked. (assuming your car is an 02 "a"4 not "s"4 which should be a 3.0l)
you could try some powdered foot spray. spray areas you suspect. the powder will absorb and show leaks and may help in narrowing your search area.
rear wheel bearing is my bet from experience. if you can, safely try swerving moderately left to right when noise is heard. if the noise changes, most likely a bearing. tire noise can be ruled out if noise is the same on various roads (like dirt). the proper "audi" bearing has blue seals. there is often confusion in the parts manual from audi.
left side only on rear fogs (cars pass on left in germany). later models use 2 but are called driving lights.