All light vehicles produced in 1996 and later must adopt the second generation on-board diagnostic system (OBDⅡI) standard. The main purpose of OBDII is to reduce emission pollution, while the main purpose of establishing OBD I (1988) is to check whether there are problems with sensors or their circuits. OBDI regulations require that the system not only test sensors but also all emission control devices, and verify whether the emission devices are working properly.
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