1hdfte/ plug on rear left side of head?

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Joined
Feb 14, 2024
Threads
2
Messages
3
Location
australia
I just had my head replaced after a timing belt failure. (Mechanic not tightening the top pully bolt up).

Long story short but i noticed a plug on the left side of the head, under 5 cylider intake manifold was doing nothing. Mechanic was not sure what is was.

Car seems to be running fine but im curious what it is?
 
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