All 4 windows on my 2002 Audi A4 Quattro stopped working at once. I have looked at the 2 fuses 22 and 23 and they "look" fine, I don't see broken pieces or anything. What else should I check?

You make it sound like it's our fault you can't find it :>D

The start of production of the Audi A4 B5 is 1994. With minor changes, it was produced until 2001. At first, only the sedan version was available, the station wagon (Avant) appeared a year later. This material provides information on relay circuits and fuses Audi A4 b5 1994, 1995, 1996, 1997, 1998, 1999, 2000, with an assignment of their elements and locations.

Can't get much clearer than this. Relay 4 is one plus 'Additional Relays 23 and 24. Plus fuse 23 and 24.

Fuse box diagram Audi A4 B5 and relay with assignment ...

https://fuseandrelay.com > audi > a4-b5

This material provides information on relay circuits and fuses Audi A4 b5 1994, 1995, 1996, 1997, 1998, 1999, 2000, with an assignment of their elements and ...
‎Passenger compartment · ‎Main fuse box · ‎Relay box · ‎Engine compartment

Next check the relays.

There you go.

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

Here you go:

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

My audi a4 2002 3.0 quattro radio just stop working with the red light that stay on. It does'nt display "SAFE" , so I don't think that is lock. Please help

I have exactly the same problem with my 2002 A4 quattro!
Hope someone has an answer

For Audi A4 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram.
First fuse on first row from left upper corner is Fuse Nr.20 = F20 (15A) - RH headlamp low beam, headlamp adjustment.
First fuse on second row from left upper corner is Fuse Nr.21 = F21 (15A) - LH headlamp low beam, headlamp adjustment.

More than likely the fuel pump. This may sound stupid but take something and give your gas tank a bit of a thump. What year is the car?

Sometimes the issue is with the mechanical vacuum pump off to the side of the ABS/ESP module. It looks like a round silver canister. This issue is all over Google with many possibilities but the one I copied is most common.

Relay located behind a panel on the drivers side of the facia, Plus the fuse as well. Hope this works for you..Check all wiring connections