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Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Lets just address the codes you have before addressing sensor readings since the computer is not flagging any O2 sensor issues. Code 0352 on a 06 Expedition means there is a misfire most likely coil related on cylinder 2. Clear the code, move this coil to another and retest to see if the code comes back for the same cylinder. Does cylinder 2 actually misfire? Have you moved and or tested the injectors? Checked the compression?
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Ford does not state a special compression tool connector is needed. I have a kit that has about 10 different hoses and fittings and do not know which I have to use without it and this model in front of me. I am very confident though each brand kit has a different part number for the hose and fitting. Let me know the results of the compression and coil and injector swap. If no concerns are found and it remains on 2, then a oscilloscope is needed to check the PCM outputs to the coil and injector to see if the PCM is faulty.