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Old 09-04-2013, 08:16 AM
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O2 sensor: Location and testing

I've been looking for a couple days now and just can't find it. Can someone please help me out? Is there a post or some info on how to check the O2 sensors, I think you can check the resistance on them. Also I think there are 4 all together one of which is difficult to get to.

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Old 09-04-2013, 08:56 AM
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Re: O2 sensor: Location and testing

I believe they are located on the exhaust pipes, 2 for each side, both pre and post cat. Look towards the top sides of the pipes. I think you can locate all of the sensors from beneath the vehicle. I cannot comment on testing the resistance, but I am curious.
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Old 09-04-2013, 09:43 AM
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Re: O2 sensor: Location and testing

That makes sense on the location, thanks. And I found a method for testing.
O2 sensor test
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Old 09-04-2013, 01:46 PM
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Re: O2 sensor: Location and testing

As you can see by the testing instructions, this won't be a picnic. Generally, testing the sensors is more trouble than it's worth. If you do any testing, the best way is to find some sort of millivolt monitoring device. I use my on board DashHawks on both my vehicles. Testing with a meter at the sensor would not be fun on a hot exhaust, with the engine running. If you have no good, easy way of testing them, and you suspect them to be your problem, IMO, just replace them. That's not so easy either. Total cost of the 4 sensors should be no more than ~$125. You may want to read this thread and see if it may help you a little......before you go any further:

Oxygen Sensors and Their Role in Engine Management--A Primer
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Old 09-06-2013, 08:36 AM
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Re: O2 sensor: Location and testing

Quote:
Originally Posted by jeepgcoman View Post
As you can see by the testing instructions, this won't be a picnic. Generally, testing the sensors is more trouble than it's worth. If you do any testing, the best way is to find some sort of millivolt monitoring device. I use my on board DashHawks on both my vehicles. Testing with a meter at the sensor would not be fun on a hot exhaust, with the engine running. If you have no good, easy way of testing them, and you suspect them to be your problem, IMO, just replace them. That's not so easy either. Total cost of the 4 sensors should be no more than ~$125. You may want to read this thread and see if it may help you a little......before you go any further:

Oxygen Sensors and Their Role in Engine Management--A Primer
Thank you for the info, something is going on though. It runs good but not quite right, gas mileage is a hair low and I suspect there might be an exhaust leak because it just doesn't sound right, doesn't sound like other GC hemis. Thanks again.
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Old 09-06-2013, 10:11 AM
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Re: O2 sensor: Location and testing

If you have an exhaust leak before the front O2 Sensors, you'll run rich....how much depends on how big the exhaust leak is. I had a pretty big header flange leak on a long trip and it cost me at least 3 mpg, and maybe more. Had to drive it ~900 miles that way, as no one wanted to tackle the repair job. Let us know what you find.
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Old 09-15-2013, 06:42 AM
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Well I could not find an exhaust leak, might be a very small one somewhere around the headers but can't tell. Guess I'll move on to the O2 sensors.

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Old 09-19-2013, 11:19 AM
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Re: O2 sensor: Location and testing

If you have an Android phone, you can install the app Torque on it and buy a cheap bluetooth dongle for the wireless connection with the jeep. You can then read the O2 sensor volts. The voltage indication goes normally from 0.2V up until 0.8 V and should be jumping up and down for the 1-1 and 2-1 sensors ( both upstream sensors, which are the main inputs for the fuel injection fine tuning).
The nice thing of the Torque app is that you can see many live data info, see DTC´s and reset DTC´s and check engine light. There is a free version with some reduced possibilities and a paid one with some more possibilities.
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Old 09-19-2013, 11:51 AM
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Quote:
Originally Posted by Frango100 View Post
If you have an Android phone, you can install the app Torque on it and buy a cheap bluetooth dongle for the wireless connection with the jeep. You can then read the O2 sensor volts. The voltage indication goes normally from 0.2V up until 0.8 V and should be jumping up and down for the 1-1 and 2-1 sensors ( both upstream sensors, which are the main inputs for the fuel injection fine tuning).
The nice thing of the Torque app is that you can see many live data info, see DTC´s and reset DTC´s and check engine light. There is a free version with some reduced possibilities and a paid one with some more possibilities.
Sweet, I'm a tech junkie so this is right up my alley. Thanks.
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Old 09-28-2013, 03:28 PM
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Re: O2 sensor: Location and testing

OK got Torque hooked up and took a couple videos. The top 2 gauges are sensor 1, the bottom 2 are sensor 2. I'm pretty sure both sensor ones are acting correctly, bouncing back and forth from roughly 0 to 1 but sensor two I'm not sure. When I first start up the sensors are at 0 and after the vehicle runs for a minute or so they come up but once in a while they will drop to 0 again. take a look and see if any of you guys know whats going on. Oh yeah the big gauge on the right is the tach in case you didn't already figure it out.

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Old 09-29-2013, 07:45 AM
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Re: O2 sensor: Location and testing

The 1-1 and 2-1 sensors are acting ok indeed. They constantly change the voltage, indicating the air fuel mixture is being fine tuned all the time.
The 2-1 and 2-2 sensors (the after cats) are indicating the catalyst efficiency. Don´t know why they stay at 0V in the beginning, but lateron they act normal by being almost steady. When the catalyst efficiency goes down, the after cat sensor voltage starts fluctuating more and more until it equals the before cat voltage. But before this happens a fault code will be set by the PCM to show that the cat efficiency is low.
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Old 09-29-2013, 08:56 AM
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Quote:
Originally Posted by Frango100 View Post
The 1-1 and 2-1 sensors are acting ok indeed. They constantly change the voltage, indicating the air fuel mixture is being fine tuned all the time.
The 2-1 and 2-2 sensors (the after cats) are indicating the catalyst efficiency. Don´t know why they stay at 0V in the beginning, but lateron they act normal by being almost steady. When the catalyst efficiency goes down, the after cat sensor voltage starts fluctuating more and more until it equals the before cat voltage. But before this happens a fault code will be set by the PCM to show that the cat efficiency is low.
That's what I was hoping on the one hand on the other I now have to continue the search for my poor fuel efficiency.
Thank you.

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