The headlight code of Audi A7 is located on the back or bottom of the headlight assembly. You can find the headlight code according to the following steps:

1. Open the hood of the vehicle for easier access to the headlamp assembly.

2. Under the hood, find the area where the headlights are installed.

3. Look for the label or logo on the back or bottom of the headlamp assembly.

On the label or signboard, you should be able to find the code of the headlight. This is a combination of letters and numbers to identify the model and specification of headlights.