02 sensor

Can someone please tell me where the 02 sensor is located on a 98 ford explorer? and do you have to get any special tool to take it out?

Is it an easy job?

Thanks.

My 98 has 5 o2 sensors. Have autozone scan for you and they will tell you which one it is. I've only had to change one so far. It was a little tight getting to the connector but other than that it was pretty easy.No special tools needed.