[JulianHicks]

I found my codes in the front of the Service book.

Here are the VAG codes I'm aware of:

7GA AGM Emission standard LEV 2
7GB AGM Emission standard ULEV 2
7GC AGM Emissions concept TIER1 for Mexico with OBD
7GD AGM Emission standard EU4 China without EOBDwith hardware modification
7GE AGM Emission standard EU4 for Japan
7GF AGM Emission standard EU3 without EOBD with hardware modification
7GG AGM Emission standard EU4 DPF
7GH AGM Emission standard EU4 without EOBD without hardware modification
7GJ AGM Emission standard TIER 2
7GK AGM Emission standard TIER2 for Mexico
7GL AGM Emission standard TIER1 for BR w/o OBD
7GM AGM Emission standard, EU3 without EOBD without hardware modification
7GN AGM Emission standard, EU4, DPF preparation
7GP AGM Emission standard TIER1 for BR with OBD
7GQ AGM Emission standard, EURO IV, DPF
7GR AGM Emission standard, C5 stage 2
7GT AGM Emission standard FTP 75
7GU AGM Emission standard MVEG 1
7GV AGM EPA TIER 3
7GW AGM BSO II
7GX AGM Marine 94/25 EG
7GY AGM Emission standard, appendix 25
7GZ AGM Emission standard not designated