It depends on whether you are in a state that requires Smog certification, and also by what you consider 'runs great'. A faulty Oxygen Sensor will never pass a Smog check, so if one is required to register the vehicle, you have no choice. Just because a vehicle seems to 'run great', doesn't mean that it actually is. I would suggest replacing the sensor as soon as your finances will allow. That sensor is an integral part of the emission system, and the emission system an integral part of the overall performance of the vehicle. Garbage in, garbage out my friend. = )
The O2 sensor is located on the exhaust, most Cherokee's have 2 exhaust banks, so there should be one on each side of the engine. Find a wrench to fit it and screw it out, there should be an electrical connection running to it so find where it connects and disconnect it. Reverse for installation.
I had that same exact problem with a 1995 Jeep Cherokee, and it was indeed a bad oxygen sensor. Relatively cheap repair too.
Check the oxygen sensor. My 1995 Grand Cherokee stopped stalling while driving after it was replaced.
If the check engine line is flashing then that means there is a real problem and you should have it looked at, But if the light is on and NOT flashing the it is most likely a problem with the emmisions system and most likely an oxygen sensor.
I believe only one, it is located at the base of the exhaust manifold, right before the exhaust pipe................good luck, Mike
Some manufacturers state that it is a general tune-up item that should be changed every 40,000 miles, while others have different criteria. It is best to look at the service schedule for your vehicle to determine when it needs to be changed.
The oxygen sensor on a vehicle will need to be changed about every 100,000 miles for the newer vehicles. An older vehicle might need this part to be changed more often. If this part is working properly, there is no need to change it, no matter how many miles are driven.
The computer could have become confused. disconnect the battery from the vehicle. Leave it unhooked for several hours. Reconnect the battery. This should reset the computer, and hopefully solve the problem.
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.
No, the ratio of nitrogen to oxygen is not changed by altitude.
Replace the sensorOnce you have changed the oxygen sensor just disconnect the battery cable for about 30 seconds and the computer will reset. If you don't make the repair it will never go away, that's what it is made for.
oxygen
You don't.
If the vehicle was built with an oxygen sensor, you will need an oxygen sensor.
In the exhaust pipe, near the engine.
If there are no other problems and the vehicle is failing the NOX emissions test, it's probably running too lean. Check the EGR valve, fuel pressure and the Oxygen sensor.
The O2 sensor is located on the exhaust, most Cherokee's have 2 exhaust banks, so there should be one on each side of the engine. Find a wrench to fit it and screw it out, there should be an electrical connection running to it so find where it connects and disconnect it. Reverse for installation.