O2-  Oxygen

Oxygen Sensor

OBD-  On-Board Diagnostics

OBD II-  On-Board Diagnostics Second Generation

OC-  Oxidation Converter Catalytic

OD-  Outside Diameter

ODM-  Output Drive Module

ODO-  Odometer

OE-  Original Equipment

OEM-  Original Equipment Manufacturer

OHC-  Overhead Camshaft

ohms-  Ohm

OL-  Open Loop, Out of Limits

ORC-  Oxidation Reduction Converter Catalytic

ORN-  Orange

ORVR-  On-Board Refueling Vapor Recovery

OSS-  Output Shaft Speed

oz-  Ounce(s)

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