Brake fluid sensor

Correct. This was chewed off so more then likely the wiring has fallen down under the harness or it was chewed down to the place where it exits the harness loom.

Basically I would just go to the bottom of the TIPM and splice in a new section of wire.

Here is a video that will help with splicing in new wires. I get this is for a headlight but the idea is to show how to properly solder wires.

https://www.youtube.com/watch?v=PxA5wczsCVo

Take a look at the diagrams and location views from the manual. Please run through this and let us know if you have other questions.

Hi, my new car is in the same position now. Rodents bit of the wiring 3rd time insurance denied paying for it. Showroom is asking to go for entire engine wiring replacement, but the bite is on single small wire. Attached to the braking fluid. Any suggestions please help.

That can be easily repaired, I would not replace the engine harness that is overkill. I would take it to another shop (not the dealer) and have it fixed, it shouldn't cost more than $120.00 to repair.