I dont know about reading blocks, never used it for that,--I guess it may depend on ECU capability as well. It read my N75 codes and static mAF which helped me repair them by splicing in some new wires. That would have probably set me back a few grand from a stealership. It has lots of menus, It does the transmisson as well --as I say its probably only limited by sophistication of the cars ecu. Selling at $50 less than the TM guy with the additional cables, roll up roll up.