How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor. This sensor is located near the transmission's edge over the flywheel gear. It sends a message to the ECU through a grey wire T55/49, then to the tachometer https://autolocksmith17482.mdkblog.com/35696903/20-reasons-to-believe-audi-a1-key-cannot-be-forgotten