2001 Chrysler PT Cruiser

Computer problem
2001 Chrysler PT Cruiser 4 cyl Two Wheel Drive Automatic 65000 miles

I have codes reading PO700, Transmission Control Switch (mil Request) and PO551 Power Steering Pressure Sensor/Switch Circuit (Range/Performance) also P1781 Pressure Switch Circuit/Engine Torque Signal Circuit on my code reader. My question is: are these all separate issues to deal with or a combination from one source that all happened @ the same time? I will purchase the parts and install them as needed, but was hoping it is all related to one source.
March 1, 2009.

Check out the related content below while we wait for the question to be answered by a professional mechanic.