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Where is the Bank 1 Sensor 2 (HO2S12) o2 sensor on my 2003 Pontiac Montana.


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Bank one is the same side of the engine as the number one cylinder. Sensor 2 is after the cat or downstream.
When you make this repair I would suggest cleaning out the fuel system as well.

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Thank you very much for the

Thank you very much for the reply. I was hoping it would be located somwhere I could actually get to. Thanks again.

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