+1 ^^^^ parasitic drain. Could do an amperage drain test by pulling fuses one at a time and put back. Make sure doors are shut and wait a minute or so.
You'll have a parasitic power drain.
Not uncommon in modern heavily electronic cars.
There are several modules in a modern car operating various items of equipment.
The dash of the A4 will house the immobiliser amongst other things.
There may well be a module not going into "sleep" mode after car shut down. It will need repair or replacement to sort it out.
SOURCE: NO manual for Audi A3 and radio not working
you can try alldatadiy. that may have the information that you need.
SOURCE: 2004 Audi A4 Avant rear parking sensors are not
Try to clean rear parking sensors. Check also electric cables and connections, clean if necessary. Commons faults are sensors out of order. If one or more sensors faults you hear only a continous constant noise when you put in "R" gear. You need a VAS, VAG-COM, Bosch KTS, ... diagnosis scantool. The factory parking system will be scaned from errors with this instrument, and you will find exactly which sensors are out of order (for example: rear left center sensor, rear right side sensor break off, short to ground or short to plus).
SOURCE: coolent system fault symbol Audi A6
1998 Audi A6 2.8
It could be that the thermostat is stuck in the open position thus providing maximum coolant flow through the engine when the engine is still cold, ie from a cold start. (The thermo should close when the engine is stopped and cold and it opens up once the coolant temp increases and the engine has been running for a few minutes.) Once the engine is hot maximum coolant flow between engine and radiator is normal.
Do you also find that your heater takes a while to provide warm air to the cabin in winter when you notice this condition?
If you do not know when the thermostat was last changed then I would suggest you change it. ( If it malfunctions and sticks in the closed position you will really have a problem). The radiator/engine coolant could no doubt do with a flush and change in any event as it should be done every 2 years. If you don't know when it was last done - do it. Cooling systems tend to be a neglected part of essential vehicle maintenance.
Cheers
Sean
Voluntary contributor.
SOURCE: audi a4 alternator not charging battery--test
With volt meter on battery start car and read voltage. When yo first put the meter on a full charged battery it should read between 13-15 volts. When you first start motor the voltage should go 3-4volts higher then when you first put it on. And then tapper down after awhile. If there is no voltage increase after start alternator is out.
Testimonial: "yup it is the alternator, trickle charged the battery and it held. After running car, it drained."
SOURCE: audi a4 1997 power steering
leave well alone and stop playing weekend mechanics ,it never needs changing
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