P0302 cylinder 2 misfire

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2007 Toyota Yaris:

Check engine light came on, P0302 came up on the computer which indicates a cylinder 2 misfire. Vehicle taken to the mechanic and he wants to put in a new coil and replace the four spark plugs. I did not have the work done because the mechanic stated that the four spark plugs are past their time.

The car has 134,000 miles. In 2017 at 107,000 miles, all four plugs were replaced by Toyota. As we all know, these should go about 100,000 miles.

Should I just go with what the mechanic is saying, whether he does it or someone else? Personally I feel like there is some other underlying issue. In 2009. diesel fuel was put into the car. The cat was replaced and so were the spark plugs. So, in this cars lifetime, it has had the original plugs and replaced twice and now ready for a third time. The battery in the car has been replaced either four or five times. Has had a new fuel injector, alternator replaced. Also, throttle plate cleaning. Are these list of things related to the coils and/or plugs?

Oh, and does anyone have toilet paper?

Thanks!