Variant distinction
MS4X describes wideband pre-catalyst lambda control for MS45.1 and an additional air-mass sensor in the secondary-air system.
Definition matching
Read the supported software list in the cited Definition Files page. Preserve the original identification and file format when comparing a calibration with a definition.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- MS4X Wiki: Siemens MS45. MS4X Wiki contributors. Source revision oldid 23142; accessed 2026-11-10.
- MS4X Wiki: Definition Files. MS4X Wiki contributors; individual definition authors retain their credits. Source revision oldid 23632; accessed 2026-11-10.