I don't know what the part is called but I have a question before I give any suggestions.
Is the part circled in yellow supposed to be connected to the part still on the engine?
If so, I would start by unscrewing the part in the engine.
The press the brown piece I circled in red and pull out/unplug the part in yellow.
Lastly a visit to the parts house is in order. I don't know the name, or what it does, but hopefully someone at a parts house - either parts store or dealer - will know or have a diagram.
For visual reference, maybe set the piece in place and get a broader picture of where it is in the engine compartment.
Is the part circled in yellow supposed to be connected to the part still on the engine?
If so, I would start by unscrewing the part in the engine.
The press the brown piece I circled in red and pull out/unplug the part in yellow.
Lastly a visit to the parts house is in order. I don't know the name, or what it does, but hopefully someone at a parts house - either parts store or dealer - will know or have a diagram.
For visual reference, maybe set the piece in place and get a broader picture of where it is in the engine compartment.