1997 Jeep Laredo Oxygen sensors

There are two on your vehicle called the upstream and downstream. One is located in front of you catalytic converter (looks like a big muffler towards the middle of your vehicle), and the other one is located directly behind the catalytic converter. If you think one may be bad, take it to get it scanned first to be sure and have a mechanic replace it as they usually do not come out easy due to corrosion.