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Old 09-13-2017, 03:09 AM
Rusty Accord Rusty Accord is offline
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Secondary O2 question

I've got a 99 sedan with an F23 engine that has a ULEV window sticker on it. I'm looking at replacing the cat with a Magnaflow Cat, and am wanting to know which O2 sensor to use, as there are 2 called out for the rear sensor on Honda's parts site. Does it really matter which one I use? I was planning on getting a new Denso sensor using an interchange number for the Honda sensor.
Thanks for any help you can offer.
Side note; I'm also replacing the rest of the exhaust (cat and cat back system) and would like to be done under there before winter sets in. Well that and I want to turn off the check engine light for the PO420 code.
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Bob 1997 Accord LX sedan w/ 5 speed F22b2 235K miles currently for sale
1999 Accord LX sedan w/ 5speed F23A1 LEV 232K miles
Sue's 2000 Accord LX sedan AT F23A1 LEV 235K miles
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Old 09-13-2017, 11:22 AM
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Re: Secondary O2 question

What are the part numbers? Maybe one of them is just a revision.
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Old 09-13-2017, 11:39 PM
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Re: Secondary O2 question

Ah, the good old P0420 code. Popped up and I reset it, popped up again then disappeared a few days later and I haven't seen it since. I would assume the two you found are interchangeable but don't quote me on that haha.
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Old 09-14-2017, 12:59 AM
Rusty Accord Rusty Accord is offline
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Re: Secondary O2 question

I think 1 is for California, and the other 1 is for everyone else (federal).
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Bob 1997 Accord LX sedan w/ 5 speed F22b2 235K miles currently for sale
1999 Accord LX sedan w/ 5speed F23A1 LEV 232K miles
Sue's 2000 Accord LX sedan AT F23A1 LEV 235K miles
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