I can't offer specifics for your car but here is some general info.

If you can't reach the tow hook with a new bumper, get a car trailer tie down strap. These have an eye at each end allowing the strap to be wrapped around the lower control arm.

MB driving lights ( on modern cars at least ) are operated by turning the headlights on then pulling the headlight switch out one click, pulling to the second click turns on the rear fog light.

The outside temp problem sounds like a grounding issue. These cars might have a instrument cluster board problem it I recall correctly. The temp sensor is in the front bumper area.