[rhyds]

Apparently the "device" was a software feature of the Bosch diesel injection system to aid *internal* dyno/rolling road testing (by stopping the control system from throwing a wobbly when the front wheels are doing 60mph and the rears 0mph). Bosch apparently told VAG it was not for use in regulatory testing.

The big issue is that Bosch supply a hell of a lot of injection control systems to loads of manufacturers. I doubt that this software feature was limited to the VAG applications.