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Old 07-06-2019, 01:41 PM   #11 (permalink)
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Not my post originally, Scott as you know from experience the 02 sensor was not put in with a spacer by Honda originally so it is only a temporary bandage for the real problem which requires more diagnostic time to correct properly I do understand how the o2 sensors work but they are not expensive to replace either vs the cat I have always found good info on Identifix when I have something I canít easy diagnose


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Old 07-06-2019, 01:46 PM   #12 (permalink)
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If you really believe that the #2 O2 sensor affects engine performance, please provide documentation.

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Old 07-06-2019, 02:25 PM   #13 (permalink)
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The rear is monitored by the ecm if it sets a code it will fail smog therefore it affects engine performance period both o2 sensors monitors must pass to not set a check engine light. If they donít they set a code you pull the code and do the diagnostic and repair or replace the problem component there is a lot of info online but it comes down to fixing the problem by diagnostic checking


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Old 07-06-2019, 02:32 PM   #14 (permalink)
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Okay, the actual code is P0134 HO2S S1 CIRCUIT HIGH VOLTAGE/NO ACTIVITY

The supporting explanation reads:

Code P0134 indicates that the Bank 1, Sensor 1 O2 electrical circuit had no activity for a predetermined amount of time.

I've done some searching with that code here in the forum...which produced 15 years worth of references and discussion. Hard to know what to make of what. When I factor out the messages that reported P0134 appearing ALONG WITH other codes, it's still pretty confusing, esp when there was a POV that this code alone, in an Insight this early (mine's a 2001 5M) was a "phantom".

Last edited by xqqqme; 07-06-2019 at 04:14 PM. Reason: Added information
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Old 07-06-2019, 02:35 PM   #15 (permalink)
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Of course it sets a code. But that's ALL it does. The P0420 does not change engine performance. Sure you need to fix stuff when there is a problem, but in the case of a P0420 on an Insight the spacer "fixes" it. By your logic if there is no code there there is no problem, therefore the problem is fixed.

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Old 07-06-2019, 04:14 PM   #16 (permalink)
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Well now we know,,your first o2 sensor dead,and no spacer there going work,,order first o2 sensor or pm me for both in a set,,75 shipped good compare to one from Honda at about 157.00 piece,,do what you like but think we all try to explain the set up,,high voltage bank 1 is number 1 location.
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Old 07-06-2019, 09:41 PM   #17 (permalink)
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P0134 is the only code my 2003 Civic Hybrid ever set. I replaced the first O2 sensor and it was forever happy. It was kind of expensive, but easy to replace. It is the top sensor, above the cat, right behind the engine. I imagine a car could run pretty poorly w/o a good sensor there.

The spacer is for the common P0420 code. It doesn't sound like that is what you have.
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Old 07-11-2019, 10:52 AM   #18 (permalink)
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Yep Bank 1, Sensor 1. Your MPG will thank you after fixing this one! I'm sure it tanked.
Also just FYI, it takes a little bit after the code is cleared for this to pop back up. O2 sensor is heated up to temp and needs to be driven for typically a few minutes at temp before the code pops back up. (If that helps answer some questions)
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