I doubt thats causing the issue.
I've seen alot worse when the cam cover seals around the spark plug bore fails and the spark plug/coil pack chamber is like a swimming pool of oil.
I expect if it's flagging a fault it's just a dead coilpack.
Does the idle change when you disconnect the electrical connection on this one.
My son's mini dropped a coil pack a few month ago, luckily on the drive. Swapped a new one in there from Euro Car Parts for about £40.
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