See also:

Gauges.
Gauges include the speedometer, tachometer, fuel gauge, and related indicators. They are displayed when the ignition switch is in ON Speedometer Displays your driving speed in mph (U.S.) or km/h ...

Emissions Testing
Testing of Readiness Codes Your vehicle uses “readiness codes,” as part of its onboard self diagnostic system. Some states refer to these codes during testing to see if your vehicle's emissi ...

If the Low Tire Pressure Indicator Comes On
■ Reasons for the indicator to come on A tire pressure is significantly low. If the compact spare tire is installed, the indicator stays on for a while, and then goes off after driving a few ...