One of the annoying niggling problems with the C4 AAN S4/S6 is the ignition switch. They all seem to fail (the plastic housing breaks and the return spring does not drive the key back to the proper "Run" position after the engine has started and you remove your hand from the key). It has been the source of at least one recall:

Recall notice

If you missed the recall or it was already done and your ignition switch isn't working right, you need to replace it because it will eventually stick "on" in the start position and ruin your starter.

The ignition switch part number is 4A0 905 849B. DO NOT get the cheap white replacement on this one. Get the Genuine VW/Seat/Skoda/Audi part which should be black. Make sure you get the replacement ignition switch from the dealer.

Here is a good replacement procedure (with photos):
Ignition Switch Replacement procedure by 02ALMSTT

If you didn't catch the switch and replace it before it failed, you may find that your starter stuck on and now the car doesn't start. Don't feel too bad, it has happened alot lately. Here is one example:

One sad story

Here is another (with an interesting ignition switch recall story):

Another failure story

As a result, you will have to replace your starter (not a big job) but PITA (and wallet).

Checking with my parts girl, Kate, the PN for the AAN starter is:

034 911 023 (with or without an X = rebuilt)

Here is a sign that another 5 cyl Audi starter will work:

There is hope (YMMV)

Checking further with Kate, she says that even a 1988 Audi 200 lists the 034 911 023 X as a replacement for the proper 035 911 023 LX (both 1.4 kW). The 034 911 023 (with or without the X) always seems to get flagged as Bosch.

Hope this helps somebody.

Dave F.

Naturally, IMHHEO™,

Dave F. aka the Librarian

93 S4, 1.8t coil pack conversion, CF (OE), S6 steering wheel, RS2'd, Samcos, MRC, TDS-1, Apikol FMIC, Eibach/Bilstein, BIRA Sys 1, relayed FP
In the basement: V8 torsen rear diff, 92 rear sway bar and cross member and too much more.
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