[Leeper]

Yup tried that. Actually I've tried a couple on there as the original was so corroded it looked to be part of the O2 sensor so for a week or so I had inadvertently added another. It wasn't until a new lower sensor arrived that I figured out I had a spacer on it. My car seems to like the original (meaning the one that came with my car in 2000 sensor with the anti-fouler) more so that throwing an immediate code with the new EOM one bought for @$60 on amazon.

As said oddly enough for unknown reasons I've not had any codes over the last week or two, it ain't broken for this moment so I'll just keep my fingers crossed and hope the mystery issue went away

 

[Adria]

The correct NTK replacement #1 sensor is 24201.

What is the difference between the NTK 24301 and 24201? Both RockAuto and Amazon show 24301 as the correct part.

 

[Rainsux]

I'm not sure. I found a reference that the wires are longer on one of them.

Sam

 

[KLR3CYL]

The 24301 is the correct number for 2000-01 models.
I think the other number listed in a previous post is a typo.
24301
24301
24301

Scott

 

[Adria]

A new NTK 24301 is installed and cleared up my P1165 CEL

 

[Paul K]

On the MY2000 there are two sensors as opposed to three on later models (two on the cat I believe an upper and lower?).

Exhaust Pipe for 2000 Honda Insight | Honda Parts Online

If you look at a Honda Exhaust parts listing they are shown as #16 Hpn 36531-PCC-014 "Sensor Oygen" which lives at the bottom of the cat and #17 Hpn 36531-PHM-A02 "LaF" which is a 5- wire sensor I got from Amazon its a NGK 24288 (this is the 5-wire sensor connector which is similar size than the other one but looks very different and connector is different as well) Discount online Honda companies want @$320 for this Amazon is $141 for the exact same thing. I've replaced the NGK sensor two years ago and recently started having p1165 issues once again.

Strange that Honda describes the upper sensor as a LaF however NGK/Amazon describes it as a 02 sensor either way I assured the upper sensor was the identical one that came out of the car before installing,

Each of the several previous p1165 threads all had similar suggestions but none had any resolution that I saw

Natalya - I'd be happy to use a blow torch on the tip (I don;t have one here or would have tried it but could find one to use) IF that is a proven solution and would be happy to report back but I have yet to see anyone resolve this hence why I'm posting and looking for actual remedies. I've also tried purchasing the 02 spacers, drilled one out to fit the spacer (02 fouler spacers) , and used every combination on both spacers trying one, then two on each sensor with no avail. This idea of simply replacing items without knowing if it will cure the problem is not isn't helpful or cost effective. Dealers LOVE to just replace stuff and charge customers until eh problem goes away but I'd much rather know which part or procedure to address and not just toss money around hoping.

Still don't know if it is the LaF sensor (replaced 2 years ago), 02 sensor, cat itself, the ECM. possibly a leaking gasket on the cat which I highly doubt, cracked cat which I highly doubt, I made sure all the ground straps are good, new 12v battery,

Just a heads up La F sensor by dealership or other car manufacturers is a reference as Lamda sensor. (02 sensor) i think from looking at other manufacturers using this description it seems to be a different description possibly linked to the deaign operation of the o2 sensor. Being a wider range of analysis. And after the catalitic converter it is less of a range and often less wires because its more of a second opinion for the ecm to make its decisions. I have seen other forums with this same discussion with O2 sensors. The same pattern seems to exist, between engine and cat is lamda or Laf and after the cat is O2. The only reasoning that seems to be in place is the purpose of each one by the ecm. Think of it as the one closest to the engine is the ecm primary opinion and after the cat is the reafirming or second opinion for the ecm. The after the cat o2 sensor will also take longer to heat up to the required reading temperature.
So in summary both are 02 sensors but what i see lamda or Laf is closest to the engine and after the cat is listed as O2 sensor. Probably a way a manufacturer shows that there is a difference. And then other vehicals i have played with all 3 are the same and interchangeable. All are 2 wire in those cases. Hope that doesnt muddy the waters but adds some clarity. Be careful going to a parts counter and asking for air flow sensor because they will probably order you a mass air flow sensor that is between the air filter box and intake, totally opposite side of the engine than the exhaust. Good luck and may the insight gods be with you.