Porsche service information identifies P90999 as PIWIS Tester 4. A 2025 service bulletin specifies it for a particular repair together with a minimum diagnostic software release; this is direct evidence of the fourth-generation tool in use.
The example bulletin does not establish every supported model, software entitlement or underlying interface manufacturer. Check the current Porsche information and the exact vehicle procedure.
Photographs and screenshots
Related pages
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Porsche service technical information: PIWIS Tester 4. Porsche Cars North America, 2025; hosted by NHTSA. Source revision page or document reviewed 2026-11-10; accessed 2026-11-10.