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Transmission fluid is a cleaning agent, if the clutches are high mileage, worn, slipping, and real dirty fluid - the new fluid could wipe out the remaining clutches and ruin the transmission.
If you are good at electrical circuit repairing, fine. Otherwise just replace it.
Yes, with an automatic trans.
I would !
The under engine cover has to be removed to access the engine and drain plug.
Make sure the radiator cooling fan is working.
Are you getting fuel pressure, is the pump running. The relay I believe is not accessable on year models close to that. Have had to wire a new relay into those that are incorporated into the module.
Have never seen one on those models.
It's probably caused do to a misfire, possible plug, coil, or intake is all possible. Not sure which sensor is being referred to. Have it scanned for more information.
If it's an obvious leak, it can't hurt. If the code comes back they should look further.