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This happens a lot with 4.6l-5.4l engines. Driving through water puddles and such the water above the hood on the outside of the car as you can see. Well the water also goes in the engine compartment, you don't see. I have put some sealer on the top ring of the spark plug boots, where it contacts the top of the spark plug hole. This seems to help with the water problem.
Things do corrode in northern states. Factory warranty covered some of the cost, with car out of warranty? Would say your lucky they paid some. Yes a lot of corrosion after salt is put on the road to melt the ice.
Had an 09 the other day, someone tried to pull it from the back and tied to the rear sway bar. The bar was bent so bad the links broke and just hanging there.
Think you have more problems then an o2 sensor. Leaky injectors/pressure regulator. Trying to remember, Warm up engine - test the gry/lt-blu wire and ground. Idle should be 0.1-0.9v, increase engine speed voltage should increase and decrease as rpms drop. If it doesn't work as stated it's probably bad.
If you understand a/c circuits you might understand, but here we go. The PCM sends a ground signal to the relay to engage it for the clutch to operate. Freon level, pressure switches, sun load sensor, outside air temp sensor, some have inside air temp sensor, thermosistor just for starters. Testing a/c clutch for power/ground or open. Now that you understand what we have to know maybe you could give us a chance to save you some money. Not trying to discourage you from asking, but it really needs to be tested by someone who knows what to check with the knowledge to know what to check and the right tools to test it with. Thanks for asking.
Have it checked for a power draw. Something is drawing the battery down after shutdown.
Thermostat, Low coolant, Temp door or control cable. Just to answer a few. Have it checked by a service center to make sure.
Will it lock from the driver door ? If so prob a bad switch. If not working at all possible broken wire in boot in door opening.
While the car is running or not running ?
Which engine do you have, 4x4 or 2wd, auto or man transmission. Was looking at a wiring dia for a 6.0U power to part of fuse box comes from underhood box 40amp mega fuse. (check 8th digit of VIN#) for engine code. LBEC 1 50amp pwrs LH window, LBEC 2 50amp pwrs door lock.