Q: we are auto repair shop mainly focus on auto repair and locksmith.  so does LAUNCH X431 scanner can do auto diagnosis and key programming ?  if not, which model should we buy ?

A:  Sorry, the LAUNCH X431 series mainly focus on auto full system diagnosis, It doesn't support key programming but key coding function.  however, it has many special  function etc as below: 

AUTOSEARCH(AutoSearch),Reset SAS, Reset Brake,  Reset Gear, Reset Oil, Reset IMMO, Reset Injec, Reset TPMS,  Reset BMS, Reset ABS Bleed , Reset ETS, Reset DPF, DEMO, EOBD2,ECUAID

If you want to buy a scanner with auto diagnosis and key programming function, we will recommend you OBDSTAR X300 DP Plus:

http://www.jiutech.com/OBDSTAR-X300-DP-Plus-X300-PAD2-C-Package-Full-Version-8inch-Tablet-Support-ECU-Programming-and-Toyota-Smart-Key_13504.html