These are possible resolutions for if you are having problems starting after entering your disarm sequence (PIN code) and getting your 2 flash confirmations. Symptoms like continuous crank without starting or ignition turning off before trying to start. This is sometimes needed for newer VAG cars, S3, SQ5, Golf mk7.5 GTI etc.

Process 1:

1. Switch on the ignition
2. Enter your disarm sequence
3. Wait for the 2 flash confirmation
4. Press the service button 5 times to enter service / valet mode
5. Wait for the 5 flash confirmation
6. Switch off the ignition
7. Toggle the ignition on and off (without trying to start) 5 times
8. Start the engine
9. If all is working now you can enter the disarm sequence to exit service / valet mode

Process 2: 

1. Switch on the ignition
2. Enter your disarm sequence
3. Wait for the 2 flash confirmation
4. Do no start the engine
5. Switch off the ignition
6. Wait 1 minute
7. Switch on the ignition
8. Enter your disarm sequence
9. Wait for the 2 flash confirmation
10. Start the engine