If the light stays on with the “Check Engine” light, it indicates an abnormal condition in exhaust emissions.
It’s safe to drive your vehicle home or to a service shop. Visit an auto service as soon as possible.
Usual problems: failed oxygen sensor, vacuum hose leaks, loose gas cap, failure in electronics
ECM computerized engine controls systems maintain the best drivability and performance at the lowest emissions. The ECM system relies on an O2-oxygen sensor. The “Service Engine Soon” or “Check Engine” lights alerts you to problems such as poor fuel mileage, reduced engine performance or excessive emissions.