One non-electronic thing both lights have in common is the communal earth connection. It's nice if that is the cause (no real cost).
You might be able to test it - use a patch lead from the battery's earth terminal (-) to a good earth point on one of the light clusters. If it then works you know that the cluster is NOT otherwise getting a good earth.
Hope this helps.
Mike
SOURCE: Audi A4 2003 Change RH frontIndicator bulb
I've just replaced mine so here goes. Undo the top two bolts first. Then remove the two screws above the radiator holding the air intake ducting in place and gently pull out the air intake pipe and move to the back of the engine, exposing the rear of the lightbulb housing. To the rear of the lightbulb housing is a bolt. You should only need to loosen the bolt and this will allow the lightbulb unit to be pulled forward clear of the car. On the back of the housing you will find a cover, remove the clip retaining the cover and fold it away, exposing the rear of the light bulb.
SOURCE: audi dash lights
If it is the display for the gears flashing, this indicates a fault with the gearbox system, this is more common on multitronic gearbox's
SOURCE: 2005 Audi A4 Emission Control System Indicator
A vehicle's Emission Control Light is a generalized indicator that there is fault or possible malfunction in the vehicle's operating system. In some cases, these warning lights will come on if a gas cap is not fully closed. It could any one of a number of sensors such as the o2 sensor or map sensor. The thing to do is have a reputable mechanic/technician run a diagnostics test on the vehicle.
SOURCE: 2000 Audi a4 headlight bulb replacement
At least on the driver side, there really is no reason to remove the entire headlight assembly. I was able to swap out the bulb fairly easily but simply removing the dust cap, popping the connector off the bulb, and then undo the clip holding the bulb in place. The just reverse order to install the new bulb. Took about 3 minutes.
SOURCE: audi a4 2-4 how do
Fixed service intervals
Press and hold button [A] 24297. Switch ignition ON. Release button [A]. The words "SERVICE" or "SERVICE IN xxxx MI" will appear in the trip recorder display. Press button [B] until the display clears and is replaced with the new service interval or "SERVICE!". Switch ignition OFF.
BUTTON A IS RIGHT OFF CHECK BUTTON BELOW SPEEDO
BUTTON B IS RIGHT OFF BUTTON A
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