You really have two of them. The first one is leading from the headers into the exhaust pipe. Get below you Jeep and start looking in the general area under the driver's door. You should see a sensor sticking into the pipe with a wire at the end. I just got under the 92 I own and see the 4 wires going to an insert, screwed into the exhaust pipe just after the two parts of the exhaust maniofold join.
It does not have a mass airflow sensor.
It is located at the driver's fender side of the the throttle body.
I had that same exact problem with a 1995 Jeep Cherokee, and it was indeed a bad oxygen sensor. Relatively cheap repair too.
If you browse this website you will be able to find what you need: http://www.jeep4x4center.com/mopar/jeep-grand-cherokee/backup-parking-sensor.htm
It is located on the passenger side of the motor after the catalytic converter. The cat is at the end of the exhaust manifold, so the connector is accessible at the motor, the sensor is accessible from underneath the car.
Need a special socket. They are located in the exaust manifold(s).
It does not have a mass airflow sensor.
It is inside the distributor.
The oil sensor is located above the oil filter next to the distributor.
above the filter
Inside the distributor.
The cam sensor is inside the distributor.
The 1994 Jeep Grand Cherokee IAT sensor can be found attached to the air intake hose. The IAT sensor will be near the air filter box.
On a 2006 Jeep Cherokee, the oxygen sensor is typically located in the exhaust system. There are usually two sensors: one before the catalytic converter (upstream) and one after it (downstream). The upstream sensor is generally found on the exhaust manifold or just after it, while the downstream sensor is located further along the exhaust pipe, near the catalytic converter. For precise location, it's best to refer to the vehicle's service manual or consult a mechanic.
It is in the distributor.
in a toilet
It is the two wire sensor next to the thermostat housing.