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 situated near the edges of the transmission, above the flywheel ring gear. It transmits a signal the ECU via the grey wire https://g28carkeys39791.isblog.net/15-things-you-didn-t-know-about-audi-a1-key-47053312