What is an Onboard Diagnostic System (OBD II)?

What is an Onboard Diagnostic System (OBD II)?  - Emission inspection readiness - Maintaining your car - Maintenance and specifications - Volvo XC60 Owners Manual - Volvo XC60

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.

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    Limitations
    In certain situations, the BLIS indicator light(s) may illuminate even when there are no other vehicles in the area monitored by the system. NOTE If the BLIS indicator lights illuminate occasion ...