How do you fit a rain sensor on an audi a4?

To fit a rain sensor on an Audi A4, start by purchasing a compatible rain sensor kit designed for your specific model year. Begin by removing the windshield wipers and the plastic cover at the base of the windshield to access the mounting area. Install the sensor on the inside of the windshield using adhesive, ensuring it's positioned correctly for optimal rain detection. Finally, reconnect any wiring and test the sensor's functionality before reassembling the cover and wipers.