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  #37  
Old 02-10-2012, 06:15 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Thanks jeepgcoman for the great writeup. Question-will the PCM be confused if NTK O2 sensors are
used instead of the listed MOPAR California O2 sensors? Is there really a difference or is it just smoke
and mirrors for more $$$ ? Or will it throw codes?

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  #38  
Old 02-11-2012, 11:57 AM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

The sensors Mopar uses (at least for the 5.7) are NTK. All I was doing is relating my experience with the Bosch upstream sensors. Sensors, other than NTK, may work fine on other engines. I've read a few have tried others, like Denso, with good results. I've also read that many Chrysler vehicles are touchy when it comes to the type sensors used. Kind of like the spark plug issue on the 5.7 too. IMO, it's best to stick with stock, or at least something that others have said works well.
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  #39  
Old 02-15-2013, 05:23 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

so if i'm reading this correctly, and I'm looking to improve fuel efficiency, i should only have to replace the 1.1 and 1.2 O2 sensors, potentially saving $100?

"The rear O2 sensors (1/2 and 2/2) are used solely to determine catalytic converter efficiency. If their indications mirror the front sensors, after the cats. have warmed up to at least 600 degrees F, the converter is not working properly and needs to be replaced. Since the converter’s job is to burn any unburned fuel, further reducing emissions, the rear sensors will normally show a richer (less oxygen) mixture, meaning that most of the air/fuel mixture has been burned off."

Because the rear ones just monitor the emissions and the work of the cat, and had no affect on fuel injection?
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  #40  
Old 02-16-2013, 09:44 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

That's true but, if yours are indeed lazy, biased or outright bad, the downstream sensors are probably in about the same condition as the fronts. For the additional $60 or so I'd change them too. This is especially true if you don't have any way to monitor the real time voltages of the various sensors and the cat. temps.

I just got back from an 800 mile trip and spent a little time monitoring my 02's. I may have a slight exhaust leak on the right side, as my 2/2 reading would periodically drop below .450 mV and then go back to normal operation after a short while. When it did this, the 1/2 sensor crosscounts would slow down, tending to spend more time on the rich side. I guess what I am saying is that if the rears are malfunctioning, but not mirroring the fronts, the PCM still takes action to correct the mixture....in my case (potential exhaust leak) add more fuel. As a side note, my fuel economy was down a little more than it should be for this time of year, and the type of driving I was doing.
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  #41  
Old 08-30-2016, 11:03 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Great write up learned alot!
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  #42  
Old 10-31-2016, 01:34 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Hi, My Jeep now has 160,000 miles on it, mostly highway, should I change the O2 Sensors or wait for a code? Thx!
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  #43  
Old 11-01-2016, 01:03 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Change the upstream and clean the throttle body, it'll do you good.
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  #44  
Old 11-01-2016, 10:03 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Quote:
Originally Posted by 05AKWK View Post
Change the upstream and clean the throttle body, it'll do you good.
For sure on the fronts, especially if the fuel economy has deteriorated!!! With those miles on it, I'd opt to change them all though, whether they're bad or not. It's not like they'll break the bank. Remember, they fail/wear out slowly (kind of like spark plugs), so unless you know the entire history of the vehicle and haven't been running a good top tier fuel forever, IMO, it's worth the small outlay of $$$. Just my 2 cents.
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  #45  
Old 11-21-2016, 12:09 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

Hi There,

Thanks for the info. I think I'll change all 4 of them. Which oens would you buy though? I wonder why the first one says Laredo, I have a Laredo.

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  #46  
Old 11-21-2016, 05:24 PM
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Re: Oxygen Sensors and Their Role in Engine Management--A Primer

The only ones I've had trouble with (and many others have reported this too) are the Bosch front (before the cats.) ones. Apparently the Bosches don't heat up quick enough, which is what was happening to me. I used NTK fronts on mine and used the Bosch's that I originally bought when I got all four. I went back to the parts place and they just replaced the front Bosches with NTK's. The rears only report the condition of the catalyst and are not needed to heat up within a certain time frame like the fronts are. I suppose you could do the same if $$$ is a factor. If I ever have to do it again, I'll just do all NTK's. Let us know what you do and how well they work.

Here's a little tidbit with some good information and recommendations about when to change the sensors. I had a "lazy" one at just over 60K on mine. As they say, the only way to properly check them is with a good scope.....which would probably cost more than the new sensors would. That's why I said that if there is some doubt or your fuel economy has significantly deteriorated, it may be time to bite the bullet and just replace them.

http://s7d9.scene7.com/is/content/GenuinePartsCompany/1704119pdf?$PDF$
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