Identification and evidence
Audi engine-management training describes the M5.4.2 ECM and its diagnostic functions. The training material describes a particular system, and does not establish identical equipment on every M5.4.2 unit.
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.