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When vehicle makers began using electronics to control certain functions, it led to vehicles being equipped with on-board diagnostic (OBD) systems to monitor and diagnose problems. Computer-controlled systems are found on every vehicle built today. With the implementation of OBDII in 1994, the number of systems capable of being accessed using a scan tool has increased. At the same time, the amount of diagnostic information available to technicians has also increased. Because of this, it has become more important for technicians to have equipment capable of accessing this information and thus, the advancement of the handheld scan tool.