Piwis Tester — 4

: Includes support for Schutz Fahrzeug Diagnose (SFD) , a security protocol that requires official authorization to unlock and modify certain vehicle control units.

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

: It covers all Porsche models, including the latest 2024–2025 releases and new electric/hybrid vehicles. Advanced Functions : Includes support for Schutz Fahrzeug Diagnose (SFD)

: Features a new VCI (Vehicle Communication Interface) that utilizes Diagnostic over IP (DoIP) for high-speed data transmission, which is essential for massive software updates on modern EV and hybrid platforms. Core Capabilities : It covers all Porsche models, including the

Under the hood, the PIWIS Tester 4 pairs with a new dongle. This is not just a pass-through adapter; it is a mini-computer. It supports DoIP (Diagnostics over IP) , which is mandatory for modern Porsche vehicles, and handles high-speed CAN FD (Flexible Data-rate) networks. The VCI 4 can buffer vehicle data and upload it to the cloud automatically when back in Wi-Fi range.

The system no longer just reads codes. It uses AI-assisted decision trees that correlate live data, freeze frames, and known Porsche technical bulletins to suggest a root cause — not just a component swap.