O2-  Oxygen

O2S-  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)
  • CHEVY:  
    • Cavalier  Cobalt  Equinox  Impala  Malibu  Monte Carlo  Tahoe  Trailblazer  Venture Van
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  • PONTIAC:  
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  • OLDSMOBILE:  
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  • WARNING LIGHTS:  
    • ABS  Check Engine  Trac / Traction Off  Theft / Security  Airbag  Power Steering  Tire Pressure
  • ENGINE OPERATION:  
    • 2.2L  3100 / 3400  3.5L  3800  4200  4.3L Vortec
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    Automotive Terms And Abbreviations- O