2008 Cadillac STS Owner's Manual - Page 224

Emissions Inspection and Maintenance Programs Some state/provincial and local governments have or might begin programs to inspect the emission control equipment on your vehicle. Failure to pass this inspection could prevent you from getting a vehicle registration. Here are some things you need to know to help your vehicle pass an inspection: Your vehicle will not pass this inspection if the check engine light is on or not working properly. To perform a check engine light bulb check with the keyless ignition, make sure the transmitter fob is in the passenger compartment. See Ignition Positions on page 2-28. Press the bottom of the Acc. button on the instrument panel and hold the button down for five seconds. The instrument panel, including the check engine light, will light up and the ignition will be on, but the engine will not start - if you press the bottom of the Acc. button only briefly, less than five seconds, the accessory power mode will be turned on, but not the ignition. After the bulb check, be sure to press and release the Acc. button again to turn the ignition off and avoid draining the vehicle's battery. Your vehicle will not pass this inspection if the OBD (on-board diagnostic) system determines that critical emission control systems have not been completely diagnosed by the system. The vehicle would be considered not ready for inspection. This can happen if you have recently replaced the battery or if the battery has run down. The diagnostic system is designed to evaluate critical emission control systems during normal driving. This may take several days of routine driving. If you have done this and your vehicle still does not pass the inspection for lack of OBD system readiness, your dealer/retailer can prepare the vehicle for inspection. Oil Pressure Light Your vehicle may have this feature. 3-70