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If your Audi Q7's push-button start system isn't functioning, the issue is often with the key fob's transponder communicating with the vehicle's receiver. The most common reason why your transponder may not be connecting is if the fob's battery is depleted. After changing the battery in your key fob and it still isn't working, there may be an issue with the alarm system. To address this, reset the alarm to reboot the immobilizer. If this doesn't resolve the issue, check the battery and starter motor to ensure they are in good condition. Typically, if your battery is dead, none of the electronic accessories will activate.
There are a few possible explanations for why the push-button start may not be functioning in an Audi Q7, such as loose or disconnected wiring, a blown fuse, or problems with the battery.