2007 Buick LaCrosse Owner's Manual - Page 190

Tire Pressure Light This light should come on briefly as you start the engine. Malfunction Indicator Lamp Check Engine Light Your vehicle has a computer which monitors operation of the fuel, ignition, and emission control systems. This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The check engine light comes on to indicate that there is a problem and service is required. Malfunctions often 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 service technician in correctly diagnosing any malfunction. This light will also come on when one or more of your tires is significantly under-inflated. Stop and check your tires as soon as it is safe to do so. If underinflated, inflate them to the proper pressure. See Tires on page 402 This light will flash for 60 seconds and then turn on solid if a problem is detected with the Tire Pressure Monitor System. See Tire Pressure Monitor System on page 411. 190