X5 Misfire one-side..
 

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..

take ur ignition coils out and check for oil in the plug tubes

They are clean..

Check the coils by disconnecting the wiring harness from them one at a time (and then reconnecting the one you disconnected before going on to the next one). If the idle doesn't change when you disconnect one of the coils you have found the problem.

What are the specific code descriptions you have for each code?