Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

Difference between upstream and downstream O2 Sensor

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Old Jul 7, 2013 | 02:24 PM
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Default Difference between upstream and downstream O2 Sensor

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"
Denso 234-4601 Oxygen Sensor : Amazon.com : Automotive Denso 234-4601 Oxygen Sensor : Amazon.com : Automotive

"Upstream"
Amazon.com: Denso 234-4620 Oxygen Sensor: Automotive Amazon.com: Denso 234-4620 Oxygen Sensor: Automotive
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Old Jul 7, 2013 | 02:27 PM
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Default Re: Difference between upstream and downstream O2 Sensor

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.
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Old Jul 7, 2013 | 02:32 PM
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Default Re: Difference between upstream and downstream O2 Sensor

Length of the wires and I think the connecter orientation is different as well. The sensors themselves are the same.
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Old Jul 7, 2013 | 02:43 PM
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Default Re: Difference between upstream and downstream O2 Sensor

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 Amazon.com: Denso 234-4209 Oxygen Sensor: Automotive

Thanks for you fast help.
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Old Jul 7, 2013 | 02:44 PM
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Default Re: Difference between upstream and downstream O2 Sensor

@Ghostaccord, since you have an Accord '96, do you know if the connection portion is the same?
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Old Jul 7, 2013 | 02:47 PM
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Default Re: Difference between upstream and downstream O2 Sensor

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.
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Old Jul 7, 2013 | 02:56 PM
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Default Re: Difference between upstream and downstream O2 Sensor

Nice!
Giong with the one below. Hope it goes well. Need it for emission test in Cali.

Denso 234-4601 Oxygen Sensor : Amazon.com : Automotive Denso 234-4601 Oxygen Sensor : Amazon.com : Automotive
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Old Jul 7, 2013 | 03:03 PM
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Default Re: Difference between upstream and downstream O2 Sensor

Originally Posted by tekram
Nice!
Giong with the one below. Hope it goes well. Need it for emission test in Cali.

Denso 234-4601 Oxygen Sensor : Amazon.com : Automotive
Good luck. I'll pray for you.. lololol I'm so glad I don't live in ****-fornia.
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Old Jul 7, 2013 | 05:34 PM
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Default Re: Difference between upstream and downstream O2 Sensor

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 Y'all can keep your 14° winters and hot days of 74° summers.





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.
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Old Jul 7, 2013 | 06:11 PM
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Default Re: Difference between upstream and downstream O2 Sensor

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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Old Jul 8, 2013 | 04:21 AM
  #11  
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Default Re: Difference between upstream and downstream O2 Sensor

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 Y'all can keep your 14° winters and hot days of 74° summers.

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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Old Jul 8, 2013 | 04:33 AM
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Default Re: Difference between upstream and downstream O2 Sensor

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...
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