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 5 is for O2 Monitor testing results. Mode 5 is usually only found in early OBDII systems. Later systems, that use CAN protocols store the same information in Mode 6 and don't use Mode 5.
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