How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor. This sensor is located near the edges of the transmission just above the flywheel ring gear. It transmits a signal the ECU via the grey wire (T55/49), https://g28carkeys01931.therainblog.com/29107163/why-audi-advanced-key-is-so-helpful-in-covid-19