See also:

If the light illuminates steadily
If the light illuminates steadily while driving or does not turn off after the engine starts, an emission control system malfunction has been detected. You should have your vehicle checked by ...

Vehicle placard
The vehicle placard is affixed to the driver’s side B-pillar. Example: The vehicle placard shows original tire size, recommended cold tire inflation pressure on each tire at maximum loaded veh ...

Lubrication oil circulation in the refrigerant circuit
Operate the air conditioner compressor at a low engine speed (at idle or low driving speeds) a few minutes each month during the off-season to circulate its oil. ...