OBDII is a set of standards and practices used to fine tune emission programs across vehicle makes and models. OBDII Mode 1 is for requesting and displaying current emission related scan data. Mode 2 is for requesting Freeze Frame data. Mode 3 is for requesting emission related trouble codes.
Mode 4 is for clearing emission related data in modules that store OBDII information. Mode 4 is for clearing trouble codes, freeze-frame data and stored test data. Mode 4 also resets all the monitors and turns off the check engine light.
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