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 on the edge of the transmission above the flywheel ring gear. It transmits a signal the ECU via a grey wire https://g2823931.thezenweb.com/why-audi-advanced-key-is-more-tougher-than-you-think-67632239