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  • MrShift@Edmunds 01/28/12 12:32 pm PST

    On your car, as you face the engine, cylinder #1 is on your LEFT.




    • The first oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/1.
    • The second oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/2.
    • A third oxygen sensor in cylinder bank # 1 would be numbered O2 Sensor 1/3.
    • The first oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 2/1.
    • The second oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 1/1.
    • If a V-6 or V-8 vehicle only uses one downstream Heated Oxygen Sensor (HO2S) it is numbered O2 Sensor 1/2, even if it uses two upstream HO2S.

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