There are only 6 buttons so the 4 digit code will be made up only of digits from 1-6.
The code cannot contain 0,7,8 or 9
If the code was 4562
You would press button 4 then 5 then 6 then 2.
Code 1 means attempt 1. Fail that will display Code 2 for 2nd attempt until it locks you out and you have to wait a long time to try again.
Personally the code for my radio is printed on a special card in the owners manual, with warnings about leaving it in the vehicle.
MK4 GTI - Sold
MK5 Jetta Turbo - Sold
MK5 Jetta 2.Slow - Until it dies.
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