Gather the Required Tools
First, assemble the essential tools, such as an appropriate socket wrench or a hex key that fits the M12-1.5 thread of the vent. Additionally, prepare a container to hold small parts, a clean cloth, and some penetrating oil in case the vent is stuck due to rust or thread - locking compound.

Access the Headlight Vent
Open the vehicle's hood or access the area where the headlight assembly is located. If there are any covers, trims, or other components obstructing the headlight vent, carefully remove them according to the vehicle's manual. This will expose the Headlight Vent M12-1.5 Thread, making it accessible for the removal process.

Apply Penetrating Oil (if needed)
If the vent seems difficult to turn or shows signs of rust or tightness, apply a small amount of penetrating oil around the base of the vent where it meets the headlight assembly. Let the oil sit for a few minutes to penetrate the threads and loosen any corrosion or hardened thread - locking compound. This can significantly ease the removal process.

Unscrew the Vent
Insert the socket wrench or hex key into the head of the Headlight Vent M12-1.5 Thread. Turn it counterclockwise to loosen the vent. Apply gentle and steady pressure, and be careful not to apply too much force at once, as this could strip the threads. If the vent is still very tight, you can try lightly tapping the wrench with a rubber mallet while turning it to break the initial resistance.

Remove the Vent Completely
Continue turning the vent counterclockwise until it is fully unscrewed from the headlight assembly. Once it is loose enough, you can remove it by hand. Place the removed vent and any accompanying washers or seals into the prepared container to keep them safe and organized.

Clean the Area
After removing the vent, use the clean cloth to wipe away any remaining dirt, debris, old thread - locking compound, or rust from the vent hole and the surrounding area of the headlight assembly. This will ensure a clean surface for reinstalling a new vent if necessary