The Oxygen Sensor on a 1989 Cherokee 4.0L is on the exhaust pipe on the left side of the engine just below the exhaust manifold. You can see it from above but you must replace it from below. It is pretty easy to reach. I recently changed mine and it took only 10 minutes using an O2 sensor wrench.
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.