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O Rings Circular rubber rings used to seal pipe and other connections.

O2 Oxygen

O2 Sensor Oxygen sensor, lambda EGO or HEGO sensor to provide exhaust oxygen content signal to the ECM.

O2S Oxygen Sensor

OBD On board diagnostic. A connector for diagnostic analysis of a vehicle's electronic systems.

OBD I Onboard Diagnostics One

OBD II Onboard Diagnostics Two

Objective The goal intended to be attained and which is believed to be attainable.

Objective Information Information that is unbiased and open minded.

Obligatory Compulsory.

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