Identification and evidence
An ATC Drivetrain repair catalogue identifies an Audi A8 AKJ 3.7-litre 1997–1999 example as Bosch M5.4.1. This is the repairer's scoped listing, not an exhaustive fitment list.
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.