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. This sensor is located near the transmission's edge just above the flywheel gear. It sends a message to the ECU via the grey wire T55/49 https://g28carkeys96202.blogzet.com/7-tips-about-audi-a1-key-that-nobody-will-share-with-you-45020650