I've got a wire loose

[Per Lindgren]

Or actually, the enigen in my car has a wire loose. There is a sensor at
the rear end of the cylinder head, right side. It isnt *in* the head, it
just sits in a metal flange at the right rear corner of the cam cover.
This sensor has two brown wires and one of them is ripped out of it's
connector. What is this sensor, and what harm is it that one of the two
wires are off? The engine is a 2.2 KV non-catalytic, 136 hp.

PerL
87 Cq