1998 Buick LeSabre Owner's Manual - Page 129

I 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. This light should come on, as a checkto show you it is working, when the ignition is on and the engine isnot running. If the light doesn't come on, haverepaired. it This light will also come on during a malfunction in one of two ways: 0 If the Light Is Flashing The following may prevent more serious damage to your vehicle: Reducing vehicle speed. Avoiding hard accelerations. Avoiding steep uphill grades. 0 If you are towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. If the light stops flashing and remains steady, see "If on the Light Is On Steady" following. If the light continues to flash, when it is safe to do so, stop the vehicle.Find a safe place to park vehicle. your Turn the key off, wait at least 10 seconds andrestart the engine. If the light remainson steady, see "If the Light Is On Steady" following. the light is still flashing, If follow the previous steps, and drive the vehicle to your dealer or qualified service center for service. Light Flashing -- A misfire condition has been detected. A misfire increases vehicle emissions and may damage the emission control system on your vehicle. Dealer or qualified service center diagnosis and service may be required. Light On Steady -- An emission control system malfunction has been detected on your vehicle. Dealer or qualified service center diagnosis and service may be required. 0