So I have these 3 problems. I have smoke coming from under the hood on the passenger side but it’s grey smoke. It’s not black or white, my 02 sensors say they have low voltage, and my car keeps going up halfway on my temp gauge. I’ve already replaced the thermostat. It worked for about 3 days then it started doing it again. When I idle it goes up almost in the red. Now the low voltage on the O2 sensors could that be caused to a damaged battery?

Replaced old wire harness from the front fuse box to the instrumental panel fuse box and then all the way to the rear compartment fuse block. And know the car won’t start and the electrical power steering wheel doesn’t work radio AC heater steering wheel controls and it will come out a park. Can anybody help me with this one please and thank you