Obd2 reads error

Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your Audi A3. If the OBD reader worked and communicated properly before the battery arc concern and since the arc occurred it will not read, this can be caused by a blown fuse, a fault within one of the computers in your vehicle, or even a fault with the OBD reader itself if it was plugged in when the arc occurred. These should all be checked into to help pinpoint which component is causing this concern so it can then be repaired properly from there. In some cases it may be best to allow a reputable repair facility to look into this concern to help identify the cause so it can then be repaired properly. If you’d like to find a trusted, certified repair shop in your area, you can check here: https://repairpal.com/certified. If you need more advice, or have any further questions about your vehicle, we’re here to help. Just give us a call at 877-913-1554 where we will be happy to assist!