If you have ever wondered if there is any difference between the Upstream and Downstream O2 sensors; the answer is "yes"! First difference: Second difference: (and most important) The Downstream O2 sensor is used to tell the ECU if the emissions system is working correctly... that's about all it does. When you get your check engine light, nearly 90% of the time it will be the O2 sensor... (or so it seems, no real data to back that statistic up). If the code is in reference to the Upstream sensor, then it is important to replace the sensor as soon as practical. Very important to avoid boost or WOT driving. If the code is in reference to the Downstream sensor, then it is important to ensure that your Catalytic Converter is not fouled up and causing an excess restriction on your engines exhaust flow. Hope this clears up any confusion as I found numerous forum sites stating that there is no real difference between the two except location, and as I used a new Downstream to plug the hole in my exhaust manifold (upstream) in order to get my car home the check engine light and Accessport state the Upstream sensor is bad, even after two ECU resets.  Trial User Thread Starter
Join Date: Jul 2013 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts I need to replace my upstream sensor and would like to use Denso on my '96 Accord DX. Is there a real difference between the two below? One says it is upstream and the other says it is downstream but they seem identical and the one that is downstream is cheaper. Is it just the wire lenght? "Downsteam" "Upstream" I am Jack's... iTrader: (3)
Join Date: Apr 2013 Posts: 794 Likes: 0 Most times that is correct. Any four wire will replace any four wire. The difference is in the computational data. The upstreams is basicly a baseline (set between two points) and the downstream is an efficiency report on the upstream converter system. Very basicly discribed mind you. Honda-Tech Member
Join Date: Mar 2007 Location: East Coast 506, Canada Posts: 11,395 Length of the wires and I think the connecter orientation is different as well. The sensors themselves are the same. Trial User Thread Starter
Join Date: Jul 2013 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts So, what do you recommend? Since I have to replace the upstream one, just pay the extra ten bucks to make sure it will work? How hard is splcing wiring on these things because the below one requires that and only costs $30. Thanks for you fast help. Trial User Thread Starter
Join Date: Jul 2013 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts @Ghostaccord, since you have an Accord '96, do you know if the connection portion is the same? Honda-Tech Member
Join Date: Oct 2012 Location: Minnesota Posts: 2,000 Likes: 0 The plugs should be the same. You could always extend, solder, and use the existing plug if you really had to. Otherwise an oxygen sensor is an oxygen sensor, just MAKE SURE you stick with a Nippon Denso one. Upstream is pre-cat, downstream is post-cat. Trial User Thread Starter
Join Date: Jul 2013 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts Nice! Honda-Tech Member
Join Date: Oct 2012 Location: Minnesota Posts: 2,000 Likes: 0 Quote: Originally Posted by tekram Good luck. I'll pray for you.. lololol I'm so glad I don't live in ****-fornia. MM Gruppe B
Join Date: Feb 2009 Location: 94577/Gaillimh Posts: 6,880 Likes: 0 Quote: Originally Posted by NZXTInerTia I'm so glad I don't live in ****-fornia. Whoa whoa whoa whoa... easy there Mr Minnesota. The only snow blower a typical Californian may ever have to deal with is a hooker greedy with the cocaine tekram if the O2 sensors don't come with shrink wrap, make sure to pick some up and use it before splicing on to make sure it is weather tight. Honda-Tech Member
Join Date: Mar 2007 Location: East Coast 506, Canada Posts: 11,395 Yall can keep your 110� summers and two seasons, F#@king Hot and F#@king wet. Those dumb communist car laws are just another bother!
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Join Date: Oct 2012 Location: Minnesota Posts: 2,000 Likes: 0 Quote: Originally Posted by MAD_MIKE Whoa whoa whoa whoa... easy there Mr Minnesota. The only snow blower a typical Californian may ever have to deal with is a hooker greedy with the cocaine Quote: Originally Posted by GhostAccord Yall can keep your 110� summers and two seasons, F#@king Hot and F#@king wet. Those dumb communist car laws are just another bother! Easy guys, Mike can go back to watching 90210 (in real life of course), and Mark can go back to drinking beer and being nice to everyone. I'll go die again in our 90deg and humid weather! Win win!
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Join Date: Mar 2011 Posts: 120 Likes: 0 Received 0 Likes on 0 Posts Quote: Originally Posted by tekram So, what do you recommend? Since I have to replace the upstream one, just pay the extra ten bucks to make sure it will work? How hard is splcing wiring on these things because the below one requires that and only costs $30. Amazon.com: Denso 234-4209 Oxygen Sensor: Automotive Thanks for you fast help. I put that sensor in my accord 96 in the catalytic converter and reuse the old connector and work perfect... Thread Thread Starter Forum Replies Last Post BLUE EH3 Honda Civic / Del Sol (1992 - 2000) 1 05-16-2005 07:24 PM LsTurbo91 Forced Induction 2 10-08-2001 09:20 PM
Are downstream and upstream O2 sensors interchangeable?They both function the same but are different enough that they cannot be swapped.
Are both O2 sensors the same?Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. You must use the correct ones, whether oem with the correct length cable and plug, or the correct "universal" equivalent, that will require you to measure and splice your old plug onto it.
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Is there a difference in upstream and downstream o2 sensors
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