1998 Pontiac Bonneville Owner's Manual - Page 127

If the Light Is On Steady You may be able to correct the emission system malfunction by considering the following: Did you recently put into your vehicle? fuel If so, reinstall thefuel cap, making sureto fully install if the the cap. The diagnostic system can determine fuel off cap has been left or improperly installed.A loose or missing fuelcap will allowfuel to evaporate into the atmosphere. A few driving trips with the cap properly If you experience one or moreof these conditions, It change the fuel brand you use. will require at least one installed should turn the lightoff. ak f. full t n of the properfuel to turn the light o f Did you just drive througha deep puddleof water? If noneof the above steps have made the light off, turn If so, your electrical system may be wet. The condition have your dealer or qualified service center check the will usually be corrected when the electrical system has vehicle. Your dealer the proper test equipment and turn dries out.A few driving trips should the lightoff. fx diagnostic tools toi any mechanical or electrical Have you recently changed brands fuel? of problems that may have developed. If so, be sure to fuel your vehicle with quality fuel (see "Fuel" in the Index). Poor fuel quality will cause your You engine not torun as efficiently as designed. may notice this as stalling after start-up, stalling when you put the vehicleinto gear, misfiring, hesitation on acceleration or stumbling on acceleration. (These conditions may go away once the engine is warmed up.) This will be detected by the system and causelight the to turn on. 2-70