Siemens MS42 ECU Tuning
Engine control unit used in 4 supported models from 1 make.
BMW with the Siemens MS42
All BMW tunes- BMW 3-serie1998+E46 · 20i, 23i, 28iAutoTuner
- BMW 5-serie1995+E39 · 20i, 23i, 28iAutoTuner
- BMW 7-serie1994+E38 · 28iAutoTuner
- BMW Z31998+2.0, 2.3, 2.8AutoTuner
About Siemens MS42 tuning
The Siemens MS42 engine control unit is supported in 4 models from BMW. We read, modify, and flash it with AutoTuner, then verify the result on our Dynojet 424xLC2 in Jenison, MI. A custom calibration optimizes fueling, ignition timing, boost, and torque limits for your exact build.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.