PIWIS 4 (part number P90999) is an advanced diagnostic system comprising specialized software and hardware designed specifically for Porsche vehicles. Unlike generic OBDII scanners, PIWIS 4 communicates with every control module in a Porsche, allowing for deep-level diagnostics, coding, and programming that are otherwise impossible.
The Ultimate Guide to the PIWIS Tester 4: Porsche’s Next-Generation Diagnostic Powerhouse
Updates control unit software variants and configures vehicle options.
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. piwis tester 4
Resetting service indicators, oil change intervals, and brake pad counters.
(If you’d like, I can expand this into a longer technical guide, a buyer’s checklist, or a workshop procedure—tell me which.)
The previous iteration, the Piwis 3, was essentially a ruggedized Panasonic laptop running Windows Embedded. The is a sleek, high-brightness 11.6-inch tablet running a custom Linux-based OS designed specifically for the harsh environment of a workshop. It is lighter, faster, and features a replaceable battery for all-day use. PIWIS 4 (part number P90999) is an advanced
As Porsche transitions its fleet toward advanced architectures—such as the high-voltage systems in the Taycan and Macan EV, and the highly integrated networks in the latest 911 (992 Gen 2) and Cayenne models—the PIWIS 4 serves as the essential bridge for technicians to service these vehicles safely and accurately. 2. Key Features and Capabilities
The PIWIS 4 introduces specialized safety routines, battery cell diagnostics, and isolation testing specifically designed for Porsche’s expanding E-Performance lineup. Core Functions of the PIWIS Tester 4
: Features a "Developer Mode" for advanced special functions such as manual flashing, installing new modules, and modifying vehicle parameters. Under the hood, the PIWIS Tester 4 pairs with a new dongle
Performing oil service, brake fluid, and other maintenance interval resets. Hardware and Setup Requirements A complete PIWIS 4 setup typically includes:
The PIWIS 4 is not just a code reader; it is a full-scale workshop management system. Technicians use it for: Guided Troubleshooting