How can you tell O2 Sensor is going bad?

joey99jb · Jul 29, 2004

Well, as the title suggests, I am curioues to know if there is a way to test whether or not the O2 Sensor needs replacement or not. I have '98 XJ and as far as I know everything seems to be running fine. I just replaced my cat two days ago with a hi-flo and I figured I might as well ask how others were able to diagnose a faulty O2 Sensor. Are there particular symptoms I should look for? Thanks!!

Joey B

red91 · Jul 30, 2004

joey99jb said:
Well, as the title suggests, I am curioues to know if there is a way to test whether or not the O2 Sensor needs replacement or not. I have '98 XJ and as far as I know everything seems to be running fine. I just replaced my cat two days ago with a hi-flo and I figured I might as well ask how others were able to diagnose a faulty O2 Sensor. Are there particular symptoms I should look for? Thanks!!

Joey B

if you replaced the cat you should have replaced the 2 O2 sensors that you have.
Symptoms... YOUR GAS MILAGE WILL SUCK !

BMWNUTw/XJ · Jul 30, 2004

O2 sensors normally have a service life of 60-75K on most foreign cars, I would imagine it's even a little shorter on these trucks since they are run on regular gas.

The O2 sensor can be tested. Here is how to test one.
http://www.ibmwr.org/ktech/O2-sensor-testing.shtml

HTH,
Matt

jneary · Jul 30, 2004

BMWNUTw/XJ said:
O2 sensors normally have a service life of 60-75K on most foreign cars, I would imagine it's even a little shorter on these trucks since they are run on regular gas.

The O2 sensor can be tested. Here is how to test one.
http://www.ibmwr.org/ktech/O2-sensor-testing.shtml

HTH,
Matt

the jeeps run on the same gas as the imports, there is no regular gas anymore. an o2 sensor can last a long time, the best way to test is with a scan tool. you would want to see smooth voltage changes. not irratic ones.

BMWNUTw/XJ · Jul 30, 2004

jneary said:
the jeeps run on the same gas as the imports, there is no regular gas anymore. an o2 sensor can last a long time, the best way to test is with a scan tool. you would want to see smooth voltage changes. not irratic ones.

I ment regular unleaded, cut me some slack this is the first time I ever owned something that didn't say "Premium Unleaded Fuel Only" on the gas tank door.

And yes, you do want smooth voltage swings.

jneary · Jul 30, 2004

unleaded is unleaded, octane has no effect on o2 sensors, poorly maintained fuel/ignition systems do. and yes an o2 sensor can go bad you just cant predict. its kinda like a lightbulb.

joey99jb · Jul 30, 2004

Cool thanks guys...I would rather be safe then sorry so I will try to invest in two O2 sensors ASAP so i don't ruin my new cat....dont want to have to buy a new one of those for a while.

Joey B

johnnyc · Jul 30, 2004

I just replaced both of my O2 sensors last week. My Jeep has 132K and the sensors are the originals. I changed them for the heck of it because of the mileage on the odometer and because I'm driving up to Canada next month.

I thought that the engine was running pretty good. But since replacing the sensors, it is running much more smoothly and the gas mileage seems to have improved. I will find out more next month on my road trip.

How can you tell O2 Sensor is going bad?

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