1995 Pontiac Sunfire Owner's Manual - Page 120

Malfunction Indicator Lamp (Check Engine Light) A computer monitors operation of your fuel, ignition and emission control systems. This light should come on when the ignition is on, but the engine isnot running, as a check to show you it is working. If Your VehicleIs Equipped withOBD I1 (2.3L Code D Engine Only) Certain vehicles are equippedwith a new emission diagnostic system.You can tell whether your vehicle has this systemby reading your tune-up label located under 11" the hood. If the label says "OBD on it, the following instructions apply. Your Pontiac is equipped with an onboard computer which monitors operation of the emission control system. This system is called OBD I1 (On-Board to Diagnostics -- Second Generation) and is intended assure that emissions are at acceptable levels for the life of the vehicle, helping to produce cleaner a environment. The CHECK ENGINE light comes on to indicate when service is required. Malfunctions often will be indicated by the system before any problem is apparent, which may prevent more serious damage to your vehicle. This system is also designed assist your to service technician in correctly diagnosing any malfunction. CHECK If it does not come on at all, have it fixed right away. If it stays on, or it comes while you are driving, the on computer is indicating that you have a problem. You should take your vehicle in for service soon. I NOTICE: If you keep driving your vehicle with this light on, after a while the emission controls won't work as well, your fuel economy won't be good and your as engine may not run as smoothly. This could lead to costly repairs not covered by your warranty. 2-67