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Discussion Starter #1
I replaced the primary rear O2 sensor few weeks ago but thought i'd share my comments.

1) Remove the engine cover.
2) You do not need to remove the ignition coils or any hoses like some other videos show.
3) The hardest part is getting the connector off the metal bracket that holds but o2 sensor connectors. Use needle nose pliers to disconnect the engine harness side. The o2 sensor side of the connection you have to do this blindly and by feel to get it off the metal bracket.
4) Use a crows foot or o2 socket attached to 6" extension to remove. Install new socket.
5) Re-mount o2 sensor connectors to metal bracket. Way easier to put them back.

This is the best video I found to be helpful.
 

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Nice job :29:

About a year and half ago, I had performed this job/maintenance item on my 2009 MDX which was just around the 100K mile mark on the odometer...(I mean I swiped my credit card for my inde-mechanic :p)- paid about $140 in labor and about $180 in parts (for both UPSTEAM O2 sensors- Bank 1, Sensor 1 and Bank 2 Sensor 1)....AFTER stumbling upon Mr. Skirmich's thread regarding this (and also after Acura Stealership quoted me $820 for this job parts and labor!!!!! :eek: :surprise:

Skirmich's 02 sensor thread
https://www.mdxers.org/forums/74-second-generation-mdx-2007-2013/153962-friday-project.html

NTK 24346 Oxygen Sensor @$90 each on Amazon
https://www.amazon.com/NTK-24346-Oxygen-Sensor/dp/B004A73MQI/ref=sr_1_2?keywords=ntk+oxygen+acura+mdx&qid=1549843693&s=gateway&sr=8-2

<center><img src="https://images-na.ssl-images-amazon.com/images/I/61FaVpuhcsL._SL1500_.jpg" width="70%" height="70%"></center>
<center><img src="https://images-na.ssl-images-amazon.com/images/I/61FaVpuhcsL._SL1500_.jpg" width="70%" height="70%"></center>

*Quoting Mr. Skirmich:
"Yes there are 4 oxygen sensors but 2 of them are redundant.. The Secondary Sensors (Oxygen Sensors) are only there for the hippies (EPA) since their only job is to measure Cat Performance (To tell you if your Cats are doing their jobs)..
The Upstreams are the important ones since those are used by the ECU to tune the engine A/F Mix and if those die the mix can be rich or lean which will destroy the cats eventually... So the Upstreams are most definitely the ones you want to keep healthy."


<center><img src="https://www.mdxers.org/forums/attachments/second-generation-mdx-2007-2013/44958d1357578246-bank-2-sensor-1-location-oxygen-mdx.png"></center>
 

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Discussion Starter #4
I bought the NTK 24346 sensor off rockauto for $65 shipped. From my experience RockAuto can have cheaper prices than Ebay or Amazon. I typically check all 3 sources and pick the lowest price.
 

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Good info- come to think of it, I think I purchased both O2 sensors from Rock Auto, b/c I cannot find this purchase on my Amazon history and also, I do recall them costing about $60-$70 each :29:....

so in summary my total cost for these O2 sensors (TWO) replacement job was about $260 total (@$120 in parts and $140 in labor)- doesn't beat saving money from doing the work myself- fat chance!- but definitely much better than the highway robbery attempt comprising the $820 quote for parts and labor from the b.s. Acura Stealership!
 

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I bought the NTK 24346 sensor off rockauto for $65 shipped. From my experience RockAuto can have cheaper prices than Ebay or Amazon. I typically check all 3 sources and pick the lowest price.
I have had some hiccups with RA by not receiving the exact brand as selected in the purchase. No big deal sometimes for non-critical parts. But, in critical parts, a little more cost in Amazon is not important compared to peace of mind of receiving the part as described.


I have not been involved in returning parts to RA. So, I cannot compared to the friendly process I have experienced with Amazon
 

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I had the P2251 and P0134 codes and replaced the rear upstream O2 sensor this afternoon. Even with the video and instructions I had a very difficult time unplugging the electrical connector. I finally figured it out by unplugging and removing the front connector which has easy access and great visibility. Unplugging and removing the front connector allowed me to better understand where I needed to grip the rear connector when working blind.

Thanks everyone!
 
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