Identification and evidence
The Chiptuner-Datenbank ECU list lists Bosch M5.3 for Toyota. The closely named M5.3S appears in a separate application catalogue; do not assume both labels identify identical hardware.
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.