2018 best OBD2 auto scanner

Hey friend,before we talk about best OBD2 auto scanner,we can learn about 5 tips. *What is OBD2 *Where is OBD2 port *What do Engine and Transmission work for *Cheap code reader VS high value scanner tool *Four best OBD2 auto scanner *What can we do for auto error codes P0171,P0101,P0420,P0300...? *Other FQA What is OBD2 ?…