1998 Cadillac DeVille Owner's Manual - Page 145

If the LightIs Flashing 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. The followingmay 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 hauledas soon asit is possible. This light should comeon, as a check to show you is it working, when the ignition on andthe engine is not is If the light continues to flash, when it is safe to do so, it running. If the light doesn't come on, have repaired. This light will also come on during a malfunction in one stop the vehicle. Find a safe place to park your vehicle. 10 Turn the key off, wait at least seconds and restart the of two ways: on engine. If the light remains steady, see"If the Light 0 Light Flashing -- A misfire condition has been Is On Steady'' following. If light isstill flashing, the detected. A misfire increases vehicle emissions and follow the previous steps, and drive the vehicle to your may damage the emission control system on your dealer or qualified service center for service. 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. If the light stops flashing and remains on steady,"If see the Light Is On Steady'' following. 2-74