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  #25  
Old 02-16-2013, 09:36 PM
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Re: Improving Gas Mileage for a layman

The ones I have are part numbers 23159 and 23160. The fronts and rear have different part numbers. They may have changed the part number for 23160 to something else, but def. a difference between fronts and rears
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  #26  
Old 02-18-2013, 11:14 AM
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Re: Improving Gas Mileage for a layman

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Originally Posted by DannyVtCa View Post
The ones I have are part numbers 23159 and 23160. The fronts and rear have different part numbers. They may have changed the part number for 23160 to something else, but def. a difference between fronts and rears
both autozone and rockauto just have the one o2 sensor saying it's for both upstream and downstream. not at all doubting you, but that's all they give for options for an 07 wk with the 3.7. would it be possible they changed it so one part fits both? i'm not implying i'm a genius with newer cars, i just know enough to be dangerous. gimme an old chevy v-8 and i'll work wonders, but this new crap with all these damn sensors drives me nuts.
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Old 02-18-2013, 08:44 PM
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Re: Improving Gas Mileage for a layman

I am 100% positive my hemi engine has two different part numbers for the o2 sensors... I changed them out myself. From the pictures I posted in this thread you can see that there is quite a bit of difference between the front and rear tips. One has four pin holes on each side, while the other has rectangular openings on each side. You cannot plug a front into a rear or vice versa because the clips are different. I just check autoparts warehouse for the 3.7 and indeed the 23159 and 23160 part numbers come up. I dunno what is up with rock auto, but usually if you call them they will give you better advice. On wholesalemopar they don't display part numbers, but the front and rears are different parts and cost different amounts. This is for a 2006 hemi or 3.7.
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  #28  
Old 02-18-2013, 09:25 PM
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Autozone has the same thing... one part on thier website with ko choice for front and back, but theres definately two different ones, one precat and one for postcat. I think napa sold them clearly marked differently
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Old 02-18-2013, 09:26 PM
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Re: Improving Gas Mileage for a layman

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Originally Posted by DannyVtCa View Post
Get a chip or tuner, that's the only way to get better economy. Supporting mods would then be intake or drop in kn filter... And a muffler or full cat back. It's too bad they don't make headers for you guys.

Return on investment for modding for better fuel economy... Is years and years away. It's not a good investment. If you go with just a muffler (125), air intake(250) and chip(300) you would be maybe around 800 after muffler install. Your much better off switching to a good synthetic motor oil, synthetic gear oil, keeping on top of plugs, egr, map... Etc. All these things have to be done anyway.

Advice... Don't mod for fuel economy, mod because you like you jeep and want to make it special. Now that mine is all modded all I do it stomp on the gas all the time so my fuel economy is worse than before.
ive got headers on my 3.7 gc, order them for an 05 libby, they fit the gc
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  #30  
Old 02-19-2013, 10:13 AM
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Re: Improving Gas Mileage for a layman

Quote:
Originally Posted by DannyVtCa View Post
I am 100% positive my hemi engine has two different part numbers for the o2 sensors... I changed them out myself. From the pictures I posted in this thread you can see that there is quite a bit of difference between the front and rear tips. One has four pin holes on each side, while the other has rectangular openings on each side. You cannot plug a front into a rear or vice versa because the clips are different. I just check autoparts warehouse for the 3.7 and indeed the 23159 and 23160 part numbers come up. I dunno what is up with rock auto, but usually if you call them they will give you better advice. On wholesalemopar they don't display part numbers, but the front and rears are different parts and cost different amounts. This is for a 2006 hemi or 3.7.
this is where it gets confusing. i checked ngk's website and they also only have 23159 for upstream and downstream. it's possible this is an error on their part. i sent an email to them inquiring as to why they only have 23159 shown, and not 23160. when i get a response, i'll share it on this thread.
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  #31  
Old 02-19-2013, 10:21 AM
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Re: Improving Gas Mileage for a layman

wow, that was a quick response.

jeep O2 sensors‏

10:15 AM
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Hello,



I show that you are correct, there is only the 23159 for this application upstream and down.





Best Regards,



Jason Norwood

NGK Spark Plugs ( USA) Inc.

Technical and Training Specialist Aftermarket Division

46929 Magellan Drive

Wixom, MI 48393

Office: (248)-926-7107

Fax: (248)-926-6938

Email: jnorwood@ngksparkplugs.com

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  #32  
Old 02-19-2013, 10:39 AM
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Re: Improving Gas Mileage for a layman

I think your right. They may have revised the o2 sensors for the 2007 year. Autopartswarehouse and mopar come up with just one o2 sensor. It's odd to me to stick a front sensor in the rear, since the front is the one that has much larger openings around the tip. I am wondering if they increased the functionality of the rear sensors in 2007... Because my rears are very simple with just four pinholes on the tip
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  #33  
Old 02-19-2013, 07:03 PM
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Re: Improving Gas Mileage for a layman

however, i checked rockauto for a 2005 and 2006 with the 3.7 and 5.7 and guess what... two different o2 sensors for upstream and downstream. so yes, they changed it in 2007 to have one o2 sensor for both applications.
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