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OBD II

Definition: Onboard Diagnostics II-A second-generation emissions diagnostic system required on all 1996 and newer vehicles (though some 1994 and 1995 model year vehicles were equipped with early versions of the system).
Related Terms
• Diagnostic Trouble Code
The OBD II system monitors vehicle emissions, and illuminates the Check Engine or Malfunction Indicator Lamp (MIL) if it detects a problem that causes emissions to exceed the federal limits by 50% or more. The OBD II system also stores diagnostic trouble codes to help technicians diagnose the cause of the emissions problem. OBD II cars and light trucks also have a standard diagnostic connector.

Related Resources:

Diagnostic Trouble Codes
How to display and read the Diagnostic Trouble codes stored in your vehicles computer.

OBD-II Diagnostic Trouble Codes
A listing of all generic OBD-II diagnostic trouble codes.

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