About the Siemens EMS generation
- ECU manufacturer
- Siemens
- Supported models
- 8
- Solutions across family
- 6
- Mapped DTC codes
- 2,800
The EMS family covers 8 control units in the Map Decoder database. Each model carries its own map definitions and its own measured DTC data, so coverage is stated per model rather than assumed for the whole generation.
Solutions available across EMS
The list below is the union of what is supported somewhere in this family. Open a model to see exactly which of these apply to it.
Catalyst Off
Disables catalyst efficiency monitoring in EMS.
Lambda / O2
Disables lambda / O2 sensor monitoring in EMS without breaking fuelling.
MAF Off
Removes mass air flow sensor dependency and its diagnostics from EMS.
OPF / GPF Off
Removes gasoline particulate filter logic from EMS calibrations.
Stage 1
Software-only performance calibration for EMS, with the supporting limiter changes.
Throttle Valve (TVA)
Disables throttle valve actuator control and monitoring in EMS.
Other Siemens ECU families
- SID19 ECUs
Siemens EMS — frequently asked questions
Which Siemens EMS ECUs does Map Decoder support?
8 models are covered: EMS2204, EMS2211, EMS3125, EMS3140, EMS3141, EMS3142, EMS3160 and EMS3161.
What can Map Decoder do on an EMS file?
Across the family the validated operations are Catalyst Off, Lambda / O2, MAF Off, OPF / GPF Off, Stage 1 and Throttle Valve (TVA). Availability differs per model — the ECU page lists exactly what is supported for that model.
Does Map Decoder correct EMS checksums?
Yes. Checksums for the regions a patch changes are recalculated automatically during patch generation.
How many DTC codes are mapped for EMS?
2,800 distinct diagnostic trouble codes are stored across the family, each with an address and byte values measured on real files.
Tune Siemens EMS files
Map Decoder analyses Siemens EMS files, detects the maps and generates a verified patch with the checksum corrected.