Posted used Carista OBD 11 for TT with 7 months of full pro functionality subscription which costs £33 a year - works well with iPhone.
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Carista
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Lngoor Bluetooth V4.0 OBD2 Car Diagnostics Scanner for iOS/Android carista, Size: 45
Carista is a smartphone application for both iOS and Android devices that allows owners to diagnose vehicle faults - reset service indicators - and customize vehicle systems without any complicated coding.
BMW E90 335i N55 3.0L - Carista Bluetooth OBD2 Adapter - BMW & Mini: Carista Is A Smartphone Application for Both iOS and Android Devices That
Carista on Gen 3 : r/ToyotaTundra