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02 sensor down stream

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what is the difficulty of changing an o2 sensor?  also its the bank 1 sensor 2. which side is that?
Vehicle: 1997 ford f150 4x4 4.6w 281

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Changing the 02 sensor is not difficult at all, using the proper tool you would have no problem , Bank 1 is where cylinder 1 is located an the other side becomes Bank 2, Sensor 2 are down stream 02 sensor or catalytic monitor sensor.

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