Siemens SID204 ECU Tuning
Engine control unit used in 6 supported models from 2 makes.
Jaguar with the Siemens SID204
All Jaguar tunes- Jaguar S-Type1999+X200 · 2.7 TDV6AutoTuner
- Jaguar XF2008+X250 · 2.7 TDV6AutoTuner
- Jaguar XJ2003+X350 · 2.7 TDV6AutoTuner
Land Rover with the Siemens SID204
All Land Rover tunes- Land Rover Discovery2004+III, IV · 2.7 TDV6AutoTuner
- Land Rover Range Rover2002+L322 · 2.7 TDV6AutoTuner
- Land Rover Range Rover Sport2005+L320 · 2.7 TDV6AutoTuner
About Siemens SID204 tuning
The Siemens SID204 engine control unit is supported in 6 models from Jaguar, Land Rover. 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.