Hi Rich, the USB diagnostic port for the ECU is shown below with access plate removed, under the standalone relay and to the right of fuse panel.

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You need to get a suitable lead from your laptop installed with the S & S ProTune app to access fault codes. Others will be along to provide more info.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone