How to synchronize your Audi key if your key FOB stops working, the Audi key FOB can stop working if, for example, there is a battery change or using the ke

Okay, that sounds like you got a discharged "new" battery. Regardless of reason (not charged battery or bad connections), it is symptomatic of not having sufficicent current and voltage form the batery to run the computers or start the car.
7. Low Battery. You might not think that the car battery has anything to do with the ignition, but it does. If the battery has been discharged, you might have trouble retrieving the key. You can tell the battery has something to do with the stuck situation if you can’t start the vehicle either. Thankfully, this situation rarely occurs.
NOW, however, after driving the car for say half hour or less, leave it off for a few minutes or longer it will not start or struggles very very bad to start like the battery is flat. The battery is new and has been coded (not an official Audi battery but big enough to power the electrics) but it does not start when it has warmed up.
Hello, help please, I have a problem with the audi q7 3.0TDI after replacing the battery (the old one has discharged a maximum), the car does not start even with cables from the second car. After diagnostics, there are no errors in the engine controller, only what came out is the steering angle sensor sensor error - terminal voltage + 30, oil
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audi q7 not starting after battery change