Hi,
Okay. The sensor is located on the driver's side of the engine toward the bottom. See pic 1 for location. Simply disconnect the wire to it and unscrew it and replace it. When doing this, make sure the wiring on it is in good condition and not corroded or damaged.
Let me know if that takes care of the issue. By the way, there is only one bank on this vehicle. If it was a V6, it would have two.
As far as a tune up, if it has been a long time, it is a good idea to do it. If for no other reason, do it for preventative maintenance. Here is a link that explains how in general how it's done:
https://www.2carpros.com/articles/how-to-tune-up-a-car-engine
Please keep in mind that if the timing belt is due to be replaced, it can cause a rough running vehicle. Also, it has a lot of miles, there could even be a compression issue.
Let me know if this helps or if you have other questions.
Joe
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Friday, January 10th, 2020 AT 7:46 PM