How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician teaches how to replace the G28 Engine Speed Sensor. This sensor is situated at the edge of transmission, above the flywheel gear. It sends a signal to the ECU via a grey wire (T55/49) and then to https://g28-car-key-solutions49456.theisblog.com/30046797/this-is-what-audi-a1-key-will-look-like-in-10-years