Emissions diagnostic trouble codes
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There are two categories of Diagnostic Trouble Code (DTC)'s that apply to OBD-II. Type A. Emissions related. Requests illumination of the MIL after one failed driving cycle. Stores a freeze frame DTC after one failed driving cycle. Type B. Emissions related. Sets a Pending Trouble Code after one failed driving cycle. For more details, go to our EOBD-Facile car diagnostic software.