1997 Buick Riviera Owner's Manual - Page 137

Malfunction Indicator Lamp (Service Engine Soon Light) Your Buick is equipped with a computer which monitors operationof the fuel, ignition and emission control systems. 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. ENGINE SOON This system is called OBD II (On-Board Diagnostics-Second Generation) md is intended to assure that emissions are at acceptable levels for the of the life vehicle, helping to produce a cleaner environment. (In Canada, OBDII is replaced by Enhanced Diagnostics.) The SERVICE ENGINE SOON lighkomes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before This may prevent more serious any problem is apparent. damage to your vehicle.This system isalso designed to assist your service techcian in correctly diagnosing any malfunction. This light should come on, as a check to show is you it working, when the ignition on and the engine not is is running. If the light doesn't come on, haverepaired. it This light will also come on during a malfunction in one of two ways: 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 is 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. 2-76