How do you turn fog lights on in Audi a4?

To turn on the fog lights in an Audi A4, locate the headlight control switch on the dashboard, usually found on the left side near the steering wheel. Turn the switch to the "On" position for the headlights, then pull the switch towards you or turn it to the fog light symbol (a lamp with three lines) to activate the fog lights. Make sure the headlights are on for the fog lights to function, as they typically won't work with just the parking lights. Always consult your vehicle's owner manual for specific instructions related to your model year.