How to Replace an Audi G28 Engine Speed Sensor In this video, Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor. The sensor is located at the edge of transmission just above the flywheel gear. It transmits a signal the ECU via a grey wire (T55/49) https://g2847115.kylieblog.com/30348139/20-reasons-to-believe-audi-a1-key-will-never-be-forgotten