Commonly Used Abbreviations - General Information: "O"
- O2
-
Oxygen
- OBD
-
On-Board Diagnostics
- OC
-
Oxidation Catalyst
- OD
-
Overdrive
- O.D.
-
Outside Diameter
- OHC
-
Overhead Camshaft
- OSS
-
Output Speed Sensor
- O/S
-
Oversize
- oz.
-
Ounce
- ozs.
-
Ounces