Highly sought after by aftermarket tuners and retrofitting specialists, this mode bypasses standard diagnostic constraints. It allows for manual alterations of module software strings, retrofitting features that the car did not leave the factory with (such as adding Sport Chrono or upgrading headlights), and changing region-locked settings.
Due to this high barrier to entry, the market features various "clone" or aftermarket PIWIS 4 kits. If you are exploring these options, keep the following in mind: piwis tester 4
