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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. = )

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Q: Should a Jeep Cherokee bad oxygen sensor be changed when the vehicle runs great with the light on or off?
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Related questions

How often should the oxygen sensor be changed?

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.


Frequency of changing oxygen sensor?

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.


Why does my car sputter after I changed the oxygen sensors?

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.


Where is oxygen sensor located on 89 jeep Cherokee?

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.


Is the ratio nitrogen to oxygen changed by altitude?

No, the ratio of nitrogen to oxygen is not changed by altitude.


How do you reset oxygen sensor indicator light on 1990 Jeep Cherokee?

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.


Cyanobacteria changed the young Earth's atmosphere by producing?

oxygen


How get oxygen from vehicle smoke?

You don't.


Do you need a oxygen sensor for headers?

If the vehicle was built with an oxygen sensor, you will need an oxygen sensor.


Where is the oxygen sensor on your 95 Grand Cherokee?

In the exhaust pipe, near the engine.


Why does your 1989 Jeep Cherokee fail the nox part on emissions?

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.


How do you change the oxygen sensor in a 1990 jeep Cherokee Lorado?

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.