Hello mgee, I'm Chris, a current Ford Lincoln Mercury employee.
Thanks for visiting Just Answer. I will do my very best to help you resolve your concerns
Your vehicle has 3 or 4 sensors depending on which exhaust it has. 2 are upstream O2 sensor and 2 are downstream catalyist monitoring sensors.
They each have one connector and it takes a special socket or a 22 mm wrench to unscrew them. Access is very tuff and sometimes must be done through the wheel well.