Here comes the clue on Audi A3 2003 to 2005 cannot learn key in all keys lost situation.
Background:
Audi A3 2006 is in this one is in AKL situation and ECU [...]
Here is the working solution to Xhorse VVDI2 key programmer various update error codes via Upgrade Kit.
Error Code 1:
Error code (22:03:00:00:00) Read [...]
Support: Chip programmer comparison: Autel XP400 (Pro) vs. Xhorse VVDI-PROG
Autel XP400 Pro vs XP400 vs VVDI-PROG
That is, Xp400 PRO has more reliable IR [...]
There are two solutions to read and write PCF79xx: Iprog+ clone + PCF79XX SD-card adapter or Xhorse VVDI PROG Programmer + PCF79XX Adapter
1. Iprog+ [...]