o2 sensors harness connector melted?

You will need to get a new pigtail for the 02 sensor and then spice it in, also you will need a new oxygen sensor. You can get the pigtail from the dealer or an auto parts store. Here is how to change the sensor out in this generic guide and I have included the instructions for your car in the images below.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the images (below). Please upload pictures or videos of the problem.