- on-board diagnostics (OBD) system;
- electronic fuel injection (EFI) system;
- exhaust gas recirculation (EGR) system;
- fuel vapor recovery system (EVAP);
- positive crankcase ventilation (PCV) system;
- catalytic converter.
This section provides general information and testing operations that can be performed at home.
If there is a suspicion that the emission control system is not working properly, first check the fuel and ignition systems. Diagnosing some emission control systems requires specialized tools and equipment.
It is important to remember that the most common cause of emission control system failure is a broken or disconnected wire or vacuum hose, so first check that they are securely connected and intact.
An information plate containing important data and information on the emission control and reduction system is attached to the underside of the hood. Also included is a label with diagrams and identification of the locations of the emission control system vacuum hoses.