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Q: O2 sensor

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I was replacing my o2 sensor that is on the manifold and the bung came off.. Do I have to weld it back on or is there another way of doing it
My car has an automatic transmission.

A: You may have to get the manifold repaired- ...

You may have to get the manifold repaired- if it can be welded on an O2 adapter nut. If not then replacing the bad manifold or pipe will be needed.

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