See also:

Exhaust Emission Control System
The Exhaust Emission Control System is a highly effective system which controls exhaust emissions while maintaining good vehicle performace. ...

Malfunction Indicator Light
This light illuminates when there is a malfunction of an exhaust gas related component and the system is not functioning properly. This light will also illuminate when the ignition key is turned ...

2. Evaporative emission control (including ORVR: Onboard Refueling Vapor Recovery) system
The Evaporative Emission Control System is designed to prevent fuel vapors from escaping into the atmosphere. (The ORVR system is designed to allow the vapors from the fuel tank to be loaded into ...