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.
See also:
Interior lighting, rear
Rear reading lights
The lights are switched on or off by pressing
each respective button. ...
Ignition mode functions
The various ignition modes are accessed with
the remote key in the ignition slot.
...
Function
Function overview
1 - Warning light, braking by driver required 2 - Controls in steering wheel
3 - Radar sensor in front grille
Adaptive Cruise Control consists of:
A cruise control system ...
