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How does the OBD II system notify the driver of a problem?

April 26, 2017driver ii notify OBD problem system

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How does the OBD II system notify the driver of a problem?

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When an emissions control malfunction is detected, a dashboard light illuminates with the message “check engine” or “service engine soon.” If the OBD II system detects a problem, the on-board computer stores a diagnostic trouble code that identifies the malfunction. Using an OBD II scan tool, a repair technician can quickly retrieve the diagnostic codes and make necessary repairs, often before a more serious problem develops.