Sensor and learning context
MS4X describes wideband pre-catalyst sensors, a secondary-air MAF and separate part/full-load learned trims for MS45.1. MS4X reference.
Keep the learning state for the operating region under evaluation with the result. When comparing successive runs, note whether the relevant trims were retained, reset or still changing. Use a plausible, ready measurement and retain both the target and observed lambda.
Definition coverage
The cited MS4X TunerPro catalogue lists 457LO02S, with 116 kB partial / 1024 kB full formats. MS4X reference.
This records the definition catalogue’s supported software at its cited revision. It does not establish that a different installed firmware has the same map layout. Preserve the read’s identity and check current tool documentation before considering a software update.
Common calibration material
The MS45 family page explains file sizes and integrity layers. Use fuel mass and injector calibration and intake model, torque and DISA for shared functions. Add future software-specific findings here with their source and measured conditions.
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.
- Siemens MS45 (revision 23142).
- Definition Files (revision 23632).