Siemens SID803 ECU Tuning
Engine control unit used in 12 supported models from 4 makes.
Citroen with the Siemens SID803
All Citroen tunes- Citroen C42005+2.0 HDIAutoTuner
- Citroen C4 Picasso2007+2.0 HDIAutoTuner
- Citroen C52001+2.0 HDIAutoTuner
- Citroen C82002+2.0 HDIAutoTuner
- Citroen Jumpy2007+II - Phase I · 2.0 HDIAutoTuner
Fiat with the Siemens SID803
All Fiat tunes- Fiat Scudo2008+2.0 JTDmAutoTuner
Lancia with the Siemens SID803
All Lancia tunes- Lancia Phedra2002+2.0 JTDmAutoTuner
Peugeot with the Siemens SID803
All Peugeot tunes- Peugeot 3072000+2.0 HDIAutoTuner
- Peugeot 3082007+2013 · 2.0 HDIAutoTuner
- Peugeot 4072007+2.0 HDIAutoTuner
- Peugeot 6072000+2.0 HDIAutoTuner
- Peugeot 8072002+2.0 HDIAutoTuner
About Siemens SID803 tuning
The Siemens SID803 engine control unit is supported in 12 models from Citroen, Fiat, Lancia, Peugeot. 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.