I am getting misfires on one side of the engine, 1-2-3-4 cylinders. I also get a 'switched oxygen sensors' error using INPA (already have switched the pre-cat o2 sensors)

Car starts fine, shakes a little then seems to be ok afterwards. I am suspecting an O2 sensor (pre-cat) problem on one side.

What do you guys think?

Ozzie..

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X5 4.4 01