you can only get engine management codes from the 4200 ODBII port? i must have been unbelievably lucky as my 2001 3200GTA gives me full engine, suspension and gearbox codes through the integrated CANBUS system. I can't believe they would have unraveled this for the 4200 but i guess is a different car. I have both a low cost portable reader in the car for on the road re-sets and also an ELM unit with a bought copy of ODBII spy, its nothing to write home about but it does work.