what is the differences between DIY and PRO OBDII Code Scanner

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An OBDII Code Scanner can provide an inexpensive means of reading and clearing codes, and maybe even checking the status of the obd2 monitors, but that's all. To read sensor data, history codes, pending codes, etc., you need a "real" scan tool, and the price jumps accordingly. An entry level OBDII Code Scanner with these features starts around $200 and goes up from there. Most DIY OBDII Code Scanner do not have bidirectional communications capability. This is done for liability reasons. Most late-model vehicles have quite a few built-in self-checks that can be performed with a dealer or professional level OBDII Code Scanner, but running these tests requires some know-how, experience and caution. For many situations, the advanced capabilities are not necessary, but when it is needed, there's no substitute for having a professional-grade OBDII Code Scanner. Pro tools typically start in the $1,500 to $2,000 range, and go up depending on the obd2 tool's capabilities and features. One change that is affecting the type of OBDII Code Scanner required to diagnose late-model vehicles is the introduction of Controller Area Network (CAN) computer systems. CAN engine control systems are much faster and smarter than previous generations of engine control systems. CAN is a high-speed data link that runs 50 times faster than the four existing obd2 communication protocols. The CAN protocol allows multiple control modules to share information, and requires special hardware and software for diagnostics. Consequently, you need a scan tool that is CAN-compliant for some 2003 vehicles, and many 2004-and-newer cars and trucks. Most older OBDII Code Scanner that were manufactured before CAN came along do not have the hardware capabilities to read the faster data and cannot be upgraded.