9x out of 10 it is just the sensor. There are 4. I would move it to another spot and see if the bank changes. If it does replace that sensor with a new one and you are good to go. (Sometimes moving it will get worse / not even start but that's fine you can just move it back. Just make sure the car is not blocking anyone type of deal.) A small socket is all you need I don't even jack it up, even for the ones on the bottom but it takes a little finess. If it is not the sensor it could be a few things, like overfilling your oil, the PCM, but these camsensors is the sensor itself that goes faulty on you. If you have a multimeter you can compare sensors that way too if you don't want to run the engine. One of them will read the wrong oHms that's the bad one.
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