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S3XY buttons “safety”/warranty implications

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Does anyone know a bit more about OBDII and what the risk of damage might be if the dongle were to malfunction ? Aside from causing a simple malfunction , I’m assuming it could result in needing to replace the MCU if sending excessive voltage ? I’m sure it’s tested but wondering what worst case scenario might be .

Sure looks tempting to finally have manual preconditioning . Why Tesla hasn’t done it in their own app I really don’t get.