Emission Control Abbreviations: "O"

On-Board Diagnostic System

Full/Partial On-Board Diagnostic

Oxidation Catalytic Converter

Overhead Cam

On-Board Refueling Vapor Recovery

ORVR Cut-Off Valve

ORVR Control Valve

ORVR Fresh Air Valve

ORVR Flow Management Valve

ORVR Fuel Tank Vapor Control Valve

ORVR Fuel Tank Vapor Recirculation Valve

ORVR Fuel Vapor Recovery System

ORVR Fuel Vent Valve

ORVR Leveling Valve

ORVR Overfill Check Valve

ORVR Refueling Control Valve

ORVR Vapor Cut Valve

ORVR Vapor Recirculating Valve

ORVR Vent Shut Valve

ORVR Vent Valve

Outer Vent Control Valve

Oxygen Sensor