PIWIS (Porsche Integrated Workshop Information System) Tester 4 is the official diagnostic and programming interface for all Porsche models from 1998 onward, with full support for current and upcoming electric vehicles (including the Taycan and future PPE-based models). It replaces the PIWIS Tester 3, offering faster communication, enhanced cybersecurity, and a more intuitive user experience.
Deducted points for brutal pricing, subscription model, and lack of beginner-friendliness. Retained points for being the absolute king of Porsche diagnostics – nothing else on earth can talk to a Taycan's battery management system like the Piwis 4. piwis tester 4