Follow these 4 simple steps to learn how to reset the service light or oil service on a Audi A6 C5 1999 - 2004. Check these AUDI A6 Accesories at the BEST PRICE HERE: Oil Service or Service Light Reset Audi A6 (1999 - 2004) in 4 simple steps Watch on STEP 1: press and hold the right button from the dashboard until… Follow these 4 simple steps to learn how to reset the service light or oil service on a Audi A6 1999 - 2004. All about money that makes money. How to reset service indicator on Audi A6 years 1999 to 2005. This service reset was performed on an Audi A6 Allroad. Steps to perform reset: 1. Turn the ignition OFF 2. Press and OgJLEo.