Replied by Eason on May 7, 2020
Is your Audi a3 a 4th generation car? The 4th generation does not need to read the PIN CODE. You can learn it by directly generating the dealer key from eeprom. If you can generate a dealer key, but fail to add the key directly ( (For example, display failed to read the chip id), then you can enter the learning key option, do not enter the add option, be sure to learn after generating successfully.
Is your Golf 2004 car 2-3.5 generation?
About Opel cars, there are many ways to read PIN CODE, such as: by abs system, by bcm system, by ecm system, by icm system
Have you tried it?