Do I really need to upgrade from PIWIS 3?
The answer is usually yes for models from 2023–2025. While PIWIS 3 can handle many 992-generation tasks, PIWIS 4 is required for full communication with the latest software modules.
What can PIWIS 4 do that PIWIS 3 can’t?
The most searched “exclusive” features are:
SFD (Schutz Fahrzeug Diagnose) Support: Secure diagnostic protection required to unlock certain modules on the newest Porsche models.
Full EV/Hybrid Support: Deep integration for the Taycan and Macan EV, including battery cell balancing and thermal management diagnostics.
Faster Processing: Improved hardware (PT4G VCI) significantly reduces wait times during full vehicle scans.
What is the PT4G VCI?
Users search for this because PIWIS 4 requires the new PT4G (Porsche Tester 4th Generation) interface. Old PIWIS 2 or generic J2534 adapters often won’t work or will have limited functionality.
Can I run PIWIS 4 on a standard laptop?
Technicians often look for the “Tablet” vs. “Laptop” versions. Most searches recommend a Panasonic Toughbook CF54 Such as Porsche Piwis Tester 4 Piwis IV Diagnostic Tool Plus Panasonic CF54 Laptop With V43.600.010 Latest Software
Does Engineering Mode (Developer Mode) still exist?
Yes. Pro users search for “E-Mode” to perform “off-the-record” coding, such as:
Disabling Auto Start/Stop permanently.
Changing the number of “comfort blinks” on the turn signal.
Activating Matrix LED headlights (standard hardware, software-locked).
Why does PIWIS 4 require a 90A charger?
This is a critical safety search. During module programming, the vehicle’s ignition must stay on for long periods. If the voltage drops below 13.5V, the ECM can be “bricked” (permanently damaged). High-end chargers like the VAS 5908 are frequently searched alongside the PIWIS 4.