Q: Oxygen sensor is seized along with spark plug number 6. Can a mobile mechanic fix problem or do I need to take the car to a shop?

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I had a mobile mechanic come out and attempt to replace oxygen sensor. He explained that it was seized and he couldn't fix it. Also said a spark plug is seized as well. Do I need to take my car to a shop or can a mobile mechanic help?

My car has 164292 miles.
My car has an automatic transmission.

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