Have been getting P2631 for a while, even after reset. ...time to change it, I guess.

Looks like the aftermarket ones are more, or near the same, than the OE if you order online. Am I missing a quality sensor that is priced lower than Acura?

 

No, OEM sensors are the best for our application. I did a DIY for the rear bank sensor, and there is some other useful information in that thread. Good luck!

https://acurazine.com/forums/3g-tl-problems-fixes-114/e-130-diy-oxygen-o2-sensor-installation-rear-upstream-f-aka-p2251-811823/

 

You need to find who makes the O2 sensors for Honda/Acura nowadays. When I needed them for my '89 Accord, I found the exact same ones made by NipponDenso (or Denso as they're now known) on the internet without the 'H' symbol silk screened on them for half the price of the Honda dealer's parts dept.

Stay away from Standard Motor Parts O2 sensors. They wouldn't alleviate the error code from the computer. The ND replacements did.
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There's no such thing as an OE O2 or AF sensor. The OEM is either Bosch or Denso, buy the equivalent. Advance and AZ carry them, look for the best deal.

 

Just my .02 on O2's, why risk having a junk aftermarket one tank your MPG? Whatever you get make sure it's OEM spec or you run the risk of your A/F being way off. For the rear one who cares, all it does is monitor if the cat works and doesn't affect fueling.

 

Because somebody else make the parts and sell the same thing in a different box, Denso in this case. Most of the time, the reboxed ones are significantly cheaper and sometimes come with a better warranty. I went ahead and bought a Acura one because even the wholesale price at AAP was just a few bucks less than the Acura online.

 

There are only a few o2 / af sensor mfgs, and they supply sensors to all auto mfgs. To classify any of them as "junk aftermarket" is inaccurate. All aftermarket mfgs have an OEM application. If you find one that is branded differently, it was still mfg'd by one of the big companies. It's also not unusual for a auto mfg to use 2 or more companies for their parts including o2 sensors. This helps keep costs low, and if a product is discontinued, they have a backup.

The biggest issue people encounter is finding the correct sensor for their application. It never surprises me how many people think all o2 sensors are the same spec.

Regarding your second statement, by rear, I'll assume you mean downstream. Upstream is compared to the downstream output to ensure closed loop function, not just converter efficiency. The rears are part of the control of the trim as well. Usually not to a great degree, but can run rich if it detects a value similar or higher than the upstream. The amount varies by the control system (i.e. honda might trim more than toyota).

 

Fair enough - my point was to buy the Honda/Acura part. I think few automotive parts are actually made by Honda, but that's a separate point!

In the thread I linked earlier, I posted that I searched around and didn't find anything conclusive about which parts were used in the 3G, but many 2G cars had issues with the Bosch sensors, so I "concluded" that Denso was the better option. Then, since the price difference was minimal, I just bought the Honda part...

 

This is where I get all my Denso sensors for 04-08 TLs including Type S http://www.ebay.com/itm/DENSO-234-50...a02834&vxp=mtr

 

The 4 Oem sensors are now $600. But 4 on ebay are $100.
does rock auto sell new?
I wonder if the sensors from a newer 3.2 accord would work? Not that they would be any cheaper. Dont know. But I have seen stuff like that on these dealer wholesaler websites, where the same part# is listed for cheaper on the accord .
anyway, any updates on sourcing a good and affordable 02 sensor?
here are some that say they are denso and cheaper than oem. https://www.ebay.com/sch/i.html?_nkw=2005+acure+tl+oxygen+denso&_trksid=m54 67.l1311&_odkw=2005+acura+tl+oxygen

 

NTK is the OE maker of our 02 sensors, not denso but denso still works...

Do you really want to buy fake sensors from ebay and risk issues? If you do, let us know how it goes! Rockauto.com has cheaper alternatives. Main thing is do you need upstream or downstream?

 

I do not know which one is bad or how many are bad because I do not have a real time reader. So I was thinking about replacing all four of them. I do not have a check engine light but I am getting that rotten egg smell under Full Throttle conditions so I think the O2 sensor(s) is not able to keep up at that high flowing output at full Throttle and high revs. It's either O2 sensors or catalytic converters. And my car has 121000 miles.
I do have an HDS software on my laptop that I don't think it will read live O2 data. But even if it did I don't know if I would be able to recognize a bad one. other than just comparing all four of them together .. and see if one was different because I've never read that kind of data anyway but hey first time for everything as usual

 

this page says OE Identical. very interesting

https://www.ngk.com/ntk-oxygen-sensors-ngk

 

Pretty sure NTK makes OEM sensors. Anyways, for Hondas, can't really go wrong with either denso or ntk. Whatever you do don't get bosh or even worse, ultra power.

 

That's because they make the OEM sensor!