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Hello, my name is Bobby. Thank you for the question. Can you tell me what size engine you have?
This is located in the side of the cylinder head. If the engine is running fine then typically it is from low or worn out oil or a clogged oil filter.
If the engine is making noise when you may have an actuator issue in the engine. The solenoid will not cause the engine to make noise but the actuator will if it is failing.
No problem. Let me know if you need anything else. Please rate when you can also. Thank you.