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O2
Oxygen
O2 (OXYGEN) SENSOR
The oxygen sensor monitors the oxygen content of the vehicle's exhaust gases and generates a voltage signal (representative of the air/fuel ratio) used by the vehicle's on-board computer for fuel control.
O2S-11
Oxygen Sensor Signal (Bank 1)
O2S-21
Oxygen Sensor Signal (Bank 2)
OASIS
Ford Motor Company Online Automotive Service Information System
OBD (ON-BOARD DIAGNOSTICS)
Refers to the self-testing ability of the vehicle's on-board computer which allows the computer to verify its own operational ability.
OBD (ON-BOARD DIAGNOSTICS)
Refers to the self-testing ability of the vehicle's on-board computer which allows the computer to verify its own operational ability.
OBD 1
On-Board Diagnostics Version 1 (also referred to as "OBD I")
OBD 2
On-Board Diagnostics Version 2 (also referred to as "OBD II")
OBD 2 Drive Cycle
An OBD 2 Drive Cycle is an extended set of driving procedures that takes into consideration the various types of driving conditions encountered in real life. These conditions may include starting the vehicle when it is cold, driving the vehicle at a steady speed (cruising), accelerating, etc. An OBD 2 Drive Cycle begins when the ignition key is turned "On" (when cold) and ends when the vehicle has been driven in such a way as to have all the "Enabling Criteria" met for all its applicable Monitors. Only those trips that provide the Enabling Criteria for all Monitors applicable to the vehicle to run and complete their individual diagnostic tests qualify as an OBD 2 Drive Cycle. OBD 2 Drive Cycle requirements vary from one model of vehicle to another. Vehicle manufacturers set these procedures. Consult your vehicle's service manual for OBD 2 Drive Cycle procedures. Do not confuse a "Trip" Drive Cycle with an OBD 2 Drive Cycle. A "Trip" Drive Cycle provides the "Enabling Criteria" for one specific Monitor to run and complete its diagnostic testing. An OBD 2 Drive Cycle must meet the "Enabling Criteria" for all Monitors on a particular vehicle to run and complete their diagnostic testing.
OBD I
On Board Diagnostics Version I
OBD II
On Board Diagnostics Version II
OBD STAT
On Board Diagnostic System Status
OC
Oxidation Catalytic Converter
OCC
Output Circuit Check (Ford)
OCIL
Overdrive Cancel Indicator Lamp
OCS
Overdrive Cancel Switch
OCT ADJ
Octane Adjust device which modifies ignition spark.
OD
Outside Diameter
OD
Overdrive
ODM
Output Device Monitor
ODS
Overdrive Drum Speed
OE
Original Equipment
OEM
Original Equipment Manufacturer
OHC
Overhead Cam Engine
OHM
Unit of electrical resistance. A circuit has one ohm of resistance when one volt applied to it produces a current of one ampere.
OHV
Over Head Valve
OL
Open Loop
On-Board Computer
The central processing unit in the vehicle's computer control system.
OPEN CIRCUIT
A circuit which does not provide a complete path for the flow of current.
ORC
Oxidation Reduction Converter
OS
Oxygen Sensor
OSAC
Orifice Spark Advance Control (Chrysler)
OSC
Output State Check (Ford)
OSCILLOSCOPE
A test instrument used to analyze an electronic circuit. The oscilloscope displays circuit activity as a waveform on a CRT screen.
OSM
Output State Monitor
OSS
Output Speed Shaft
OTIS
Overhead Travel Information System
OVCV
Outer Vent Control Valve
