2003 Buick Regal Owner's Manual - Page 141

Tire Pressure Light Your vehicle may have a tire pressure monitor that can alert you to a large change in the pressure in one tire. Malfunction Indicator Lamp Service Engine Soon Light LOW TI RE 7 1 ISERVICE ENGINE Your vehicle is equipped with a computerwhich monitors operation of the fuel, ignition and emission control systems. After the system has learned tire pressures with properly inflated tires, the LOW TIRE light will come on if the pressure in one tire becomes 12 psi (83 kPa) lower than the other three tires. The tire inflation monitor system won't alert you if the pressure in more than one tire is low, if the system is not yet calibrated, or if the vehicle is moving faster than 70 mph (1 10 km/h). When the LOW TIRE light comes on, you should stop as soon as you can and check all your tires for damage. (If a tire is flat, see If a Tire Goes Flat on page 5-67.) Also check the tire pressure in all four tires as soon as you can. See Inflation -- Tire Pressure on page 5-58. The light will stay on (while the ignition is on) until you reset (calibrate) the system. See Tire Pressure Monitor System on page 5-59. This system is called OBD II (On-Board Diagnostics-SecondGeneration) and is intended to assure that emissions are atacceptable levels forthe life of the vehicle, helping to produce a cleaner environment. The SERVICE ENGINE SOON light comes on and a chime will sound to indicate that there is a problem and service is required. Malfunctionsoften will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle.This system is also designed to assist your servicetechnician in correctly diagnosing any malfunction. Notice: If you keep driving your vehicle with this light on, after a while, your emission controls may not work as well, your fuel economy may not be as good and your engine may not run as smoothly. This could lead to costly repairs that may not be covered by your warranty. 3-36