Volvo XC60: What is an Onboard Diagnostic System (OBD II)? - Emission inspection readiness - Maintaining your car - Maintenance and specifications - Volvo XC60 Owner's ManualVolvo XC60: What is an Onboard Diagnostic System (OBD II)?

OBD II is part of your vehicle's computerized engine management system. It stores diagnostic information about your vehicle's emission controls. It can light the Check Engine light (MIL) if it detects an emission control "fault." A "fault" is a component or system that is not performing within an expected range. A fault may be permanent or temporary. OBD II will store a message about any fault.

    How do states use OBD II for emission inspections?
    Many states connect a computer directly to a vehicle's OBD II system. The inspector can then read "faults." In some states, this type of inspection has replaced the tailpipe emission ...

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