The red warning light is a crucial alert component for classic Citroën models such as the 11CV, 15CV, 2CV, DS, and HY. This light alerts the driver to potential vehicle issues, such as oil pressure problems, temperature increases, or electrical faults. Noticing this light promptly can be vital to prevent further damage to the engine or other parts. The red light is designed to be clearly visible on the dashboard, allowing drivers to take immediate action if it illuminates. Replacing this light with an authentic part helps maintain the car's original aesthetic and functional integrity.