Marelli IAW 4HV ECU Tuning
Engine control unit used in 12 supported models from 3 makes.
SEAT with the Marelli IAW 4HV
All SEAT tunes- SEAT Altea2004+1.4i 16vAutoTuner
- SEAT Cordoba2002+1.4i 16vAutoTuner
- SEAT Ibiza2002+6J, 6L · 1.4i 16vAutoTuner
- SEAT Leon2005+1P · 1.4i 16vAutoTuner
- SEAT Toledo2006+5P · 1.4i 16vAutoTuner
Skoda with the Marelli IAW 4HV
All Skoda tunes- Skoda Fabia2000+1.4i 16vAutoTuner
- Skoda Octavia2005+1.4i 16vAutoTuner
- Skoda Roomster2006+1.4i 16vAutoTuner
Volkswagen with the Marelli IAW 4HV
All Volkswagen tunes- Volkswagen Caddy2004+2K · 1.4i 16vAutoTuner
- Volkswagen Golf2003+V · 1.4i 16vAutoTuner
- Volkswagen Polo2005+6R, 9N3 · 1.4i 16vAutoTuner
- Volkswagen Vento2010+1.4i 16vAutoTuner
About Marelli IAW 4HV tuning
The Marelli IAW 4HV engine control unit is supported in 12 models from SEAT, Skoda, Volkswagen. 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.