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There should be 4 O2 sensors.. (2 for each bank?)
Have you check the compression of your block? It could be your head / valves or a leaky head gasket.
What does the OBD2 scan tells you? If all the cylinders are misfiring it can be as fundamental as the hall sensor etc.
It doesn't sound like a dealer's work at all, if they don't scan the computer first. The things you have listed seems to be part of a normal maintenance checkup.
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