How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. The sensor is located on the outside of the transmission over the flywheel gear. It sends a message to the ECU via the grey wire https://carlocksmith82946.blogdigy.com/what-is-audi-advanced-key-and-how-to-use-it-44996821