1996 Buick Century Owner's Manual

This system is called OBD I1 (On-BoardDiagnostics-Second Generation) and is intended to assurethat emissions are at acceptable levels for the of life thevehicle, helping to produce a cleaner environment. (InCanada, OBD I1 is replaced by Enhanced Diagnostics.)The SERVICE ENGINE SOON light comes on toindicate that there is a problem and service is required.Malfunctions often will be indicated by the systembefore any problem is apparent, which may prevent moreserious damage to your vehicle. This system is alsodesigned to assist your service technician in correctlydiagnosing any malfunction.NOTICE:This light should come on, as a check to show you itworking, when the ignition is on and the engine not isrunning. If the light doesn’t come on, have it repaired.This light will also come on during a malfunction in onof two ways:00Light Flashing -- A misfire condition has beendetected. A misfire increases vehicle emissions andmay damage the emission control system on yourvehicle. Dealer or qualified service center diagnosisand service is required.Light On Steady -- An emission control systemmalfunction has been detected on your vehicle.Dealer or qualified service center diagnosis andservice may be required.If you keep driving your vehicle with this lighton, after a while, your emission controls may notwork as well, your fuel economy may not as begood and your engine may not run as smoothly.This could lead to costly repairs that may not becovered by your warranty.2-55