I need to replace the oxygen sensor (both) and I don't know where they are located. do you have a diagram that can show me were tthey are?

no need for a diagram
the heated oxygen sensors are in the exhaust manifold/ pipe before the cat converters
one in each bank

bank 1 exhaust is the rear manifold towards the windshield side. Follow the exhaust down. There should be one oxygen sensor before the catalytic converter and a monitor after the catalytic converter. Be Careful.. they look the same.

In the exhaust system under the car.

You need a shop manual with electrical diagrams.But why are you wanting to connect to it? DON-O

If you're getting a code for a heated oxygen sensor circuit problem, replace the sensor. I don't think I've ever seen a fuse be the problem. Bank 1 is located at the back of the engine compartment, close to the firewall. Sensor 2 is the sensor after the catalytic converter.

I believe that there is only one catalytic converter.
Don't be in a hurry to replace the catalyst. On an OBD II system, the computer will often throw a code for low catalyst efficiency when the oxygen sensors get old and slow to respond.
How old are your oxygen sensors? If they have over 100k miles on them, I would start there. Don't believe someone who throws a digital voltmeter on the oxygen sensor and pronounces it to be 'good'. A voltmeter will tell you if the oxygen sensor is dead, but it won't tell you if it is slow-responding, which often happens on 100k+ mile sensors.

Diagram: Ford Explorer and V8 O2 (Oxygen) Sensor Locations

Ford Explorer and V8 O2 Sensor Locations diagram. This shows the location of Ford oxygen sensors on Bank 1 and Bank 2. If you want to know where your O2 sensors are, this diagram is your guide.



Hope helps.

your oxygen sensor or sensors are located on your exhaust pipe just after your exhaust manifold