O2 Sensor on a Carb Engine Question

Newbomb Turk said

You should write a book with all the customer complaints and explanations they come up with.

You’d sell millions of copies.

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I was a professional certified mechanic for decades.
Caddy needed head gaskets and the computer was dumping huge amounts of fuel into the engine.
I did the head gaskets and had him sign an agreement to NOT drive the car until the computer was fixed or replaced.
He drove it anyway and blew it up.
Then sued me.
He lost of course.