Hi,

I did this on my car this weekend.
Background: engine stopped while cruising at low speed.
It was possible to restart the engine after a while (cooled).
This is typical behavior when the G28 sensor goes bad.
You can find the exchange info here: http://www.audiv8.com/german/faq/faq_show.php?id=201

The connectors are somebit hard to reach.
They are located directly under the vacuum clock for the auto cruise (under the left hand distributor)

It is often a good idea to change the other sensor as well.

Audi V8 3.6 1990 Gold metallic Audi Ur-S4 2.2 1992 Black