Identification and evidence
A Snap-on Volkswagen/Audi diagnostic coverage guide lists Motronic M5.9 and M5.9.2 separately. Keep the full designation and software identity with the vehicle record.
Identification and scope
Retain the complete ECU designation, Bosch and vehicle-manufacturer part numbers, engine, vehicle year and market, hardware and software identity. Similar names do not establish shared pin assignments, calibration files or programming procedures. Examples above are source-scoped and are not a complete fitment list.
Source accessed 10 November 2026.