Where is the downstream oxygen sensor plug located?

Here is the location of the front and rear oxygen sensor. The lead will go inside the car so you will need to remove the seat and pull up some of the carpet. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

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

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.