Wire running along the back of the oil pan???

[88260e]

Ok so there is a wire running along the back of the oil pan on my 400E and its wire tied to the back of the oil pan? It comes down from one side of the motor and goes up te other side I noticed it goes up under the motor mount bracket on the passanger side? Its in very bad shape, and I need to find ou what it is so I can replace it!