Systems & Components Monitored Under OBD II

OBD II regulations identify specific systems which must be monitored for any problem which would allow emissions to increase to a level above 1.5 times the federal standards which that vehicle was certified to meet when new, An OBD II system checks for:

^ Catalytic Converter Efficiency
^ Heated Catalytic Converter Heating Function (when applicable)
^ Engine Misfire
^ Evaporative Emission System Effectiveness
^ Secondary Air Injection System Function
^ R-12 A/C Refrigerant Leakage (Saab uses R134a)
^ Fuel Trim System Monitoring
^ Pre-catalyst oxygen sensor Efficiency
^ Post-catalyst sensor Efficiency
^ EGR System Function (when applicable)
^ Comprehensive Component Monitoring (an extensive list of sensors and ECM controlled output devices which are monitored because their malfunction could affect emissions)

As you can see this is a generic list designed to apply to all manufacturers. Each of the systems which will be found on 1996 Saab models will be covered extensively latter on in this book.