OBD-II is the latest industry standard, which was introduced on 1996 vehicle models. As a result, It provides monitoring of nearly all engine controls.
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The most useful part of OBD to most drivers is the ability to read information from the vehicle. You can read trouble codes, and even monitor real-time statistics such as RPM, vehicle speed, etc. There are a variety of different devices on the market ranging from basic code scanners to advanced displays.