This means:
* 5: There are 5 lug holes on the wheel.
* 112: The diameter of the circle that passes through the center of each lug hole is 112 millimeters.
Please note that there may be variations in the bolt pattern depending on the specific model and trim level of the 2001 Audi A4. You can verify this information by consulting your owner's manual or contacting an Audi dealer.