Stihl Diagnostic Software 20 Updated May 2026

STIHL Diagnostic Software (SDS) enables dealers and qualified users to troubleshoot, calibrate, and update electronic engine management systems, such as M-Tronic and fuel-injected models, using the MDG 1 or ADG 2 hardware interfaces . The software, which can be sourced via the STIHL B2B portal, allows for reading fault codes, analyzing operational data, and performing firmware upgrades on supported equipment . For more information on the diagnostic process, you can view the video demonstration of the Stihl MDG1 tool . Stihl MDG1 vs Husqvarna Auto Tune Diagnostic Tools

The diagnostic port on your tool is often tucked away behind a small rubber flap. Ensure this area stays free of sawdust and bar oil to prevent connection issues. Conclusion stihl diagnostic software 20