2009 Buick LaCrosse Owner's Manual - Page 152

Warning Lights, Gages, and Indicators Warning lights and gages can signal that something is wrong before it becomes serious enough to cause an expensive repair or replacement. Paying attention to the warning lights and gages could prevent injury. Warning lights come on when there may be or is a problem with one of the vehicle's functions. Some warning lights come on briefly when the engine is started to indicate they are working. Gages can indicate when there may be or is a problem with one of the vehicle's functions. Often gages and warning lights work together to indicate a problem with the vehicle. When one of the warning lights comes on and stays on while driving, or when one of the gages shows there may be a problem, check the section that explains what to do. Follow this manual's advice. Waiting to do repairs can be costly and even dangerous. 9. Remove the old air filter. 10. Install a new passenger compartment air filter. See Maintenance Replacement Parts on page 6-13 for the type of filter to use. Make sure it slides under the compartment retainers. 11. Reverse Steps 1 through 8. For best climate control performance, re-installation of a clean air filter is required. 3-30