Tuning Wiki
WikiSiemens MS41History

Siemens MS41

Revision 2

by llandowtuninguk@gmail.com
Expand from MS4X with shared MS guidance, ECU/software-specific detail and permanent source citations.

This is a historical revision. Read the current page or return to its history.

Page organisation in this revision
Page type
ECU hub
Subject
ECUs
Parent
Siemens MS
Applies to
No ECU-specific applicability
Tool groups
Not recorded in this older revision
Manufacturers
Not recorded in this older revision

Identification and variants

MS4X describes C166-based MS41 hardware and a common 256 kB flashable version. Its hardware list is incomplete; verify the installed unit rather than assuming every MS41 is flashable. MS4X reference.

Choose MS41.0, MS41.1 or MS41.2 for the documented engine/emissions context.

Documented 256 kB layout

StartEnd inclusiveRegionSize
0x000000x07FFFBootloader / UIF32 KiB
0x080000x0FFFFUndocumented32 KiB
0x100000x15FFFCalibration24 KiB
0x160000x1FFFFUndocumented40 KiB
0x200000x3FFFFProgram128 KiB

These are full-image offsets. MS4X reference.

For a raw calibration slice starting at 0x10000, a full-image address of 0x10020 would be offset 0x20 within that slice. This is address arithmetic, not an instruction to change the definition’s configured offset. Check the actual file format and XDF address basis first.

Calibration route

Use the MS41 map guide for fueling, ignition and idle entry points. Start with file identification and injector-data checks before modifying a working file.

Keep boot/identity information distinct from calibration work. Preserve undocumented regions in backups and comparisons; an undocumented label does not establish unused memory.

Sources and scope

Original reference notes by Tuning Wiki, informed by the linked MS4X Wiki pages. MS4X Wiki contributors and the authors credited by each linked project remain the source authors. Sources checked 10 November 2026. Suggested validation steps and worked arithmetic are editorial guidance; they are not a tested calibration or a claim of hardware verification.