Small exhaust pipes under the hood burning my sensor?

Hello,

Just to clarify are you talking about the exhaust manifold possibly burning the sparkplug wires?
The exhaust manifold can damage the spark plug wires if they wires are not installed properly or if the are missing the guides. Which will make the wires come in contact with the manifold and that will burn/melt the wires.

https://www.2carpros.com/articles/how-exhaust-systems-work

Please let me know of any questions.
Thank you.