2004 Chrysler Concorde Owner Manual - Page 191

MAINTAINING YOUR VEHICLE 191 ONBOARD DIAGNOSTIC SYSTEM (OBD II) To meet new government regulations and promote cleaner air, your vehicle is equipped with a sophisticated onboard diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transaxle control systems. When these systems are operating properly, your vehicle will provide excellent performance and fuel economy, as well as engine emissions well within current government regulations. If any of these systems require service, the OBD II system will turn on the Malfunction Indicator or Service Engine Soon Light. It will also store diagnostic codes and other information to assist your service technician in making repairs. Although your vehicle will usually be driveable and not need towing, see your dealer for service as soon as possible. CAUTION! Prolonged driving with the light on could cause further damage to the emission control system. It could also affect fuel economy and driveability. The vehicle must be serviced before any state emissions tests can be performed. If the light is flashing, severe catalytic converter damage and power loss will soon occur. Immediate service is required. If the gas cap is not tightened properly, the light may come on. Be sure the gas cap is tightened every time you add fuel. Tighten the cap until you hear it "click." 7