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Old 07-24-2023, 10:45 AM #1
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O2 sensor spacers
I had the catalyst issue a few years back. Replaced the cats/manifolds and the 02 sensors. Was good for a while now I’m getting the codes again. I was told if I used aftermarket parts I’d need to install 02 sensor spacers due to the computer being extremely picky with aftermarket stuff.

Has anybody used spacers and if so what would you recommend.

Thanks in Advance
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Old 07-24-2023, 11:06 AM #2
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V6 or V8?

You say you replaced the manifolds and O2 sensors a few years back and are getting codes again. My first question is did you use OEM parts or aftermarket replacements?

Aftermarket parts work but will not last as long as OEM parts. Sensors should be replaced with Denso or OEN, which happens to be Denso. Aftermarket cats/manifolds work for a few years but the material for the cats is no where near as good as the OEM stuff and they don't last.

Using O2 spacers is basically a band aid for the actual problem. Replace the parts with OEM parts and make sure the rest of the maintenance is up to date on the vehicle.
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Old 07-24-2023, 12:07 PM #3
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Quote:
Originally Posted by xtremewlr View Post
V6 or V8?

You say you replaced the manifolds and O2 sensors a few years back and are getting codes again. My first question is did you use OEM parts or aftermarket replacements?

Aftermarket parts work but will not last as long as OEM parts. Sensors should be replaced with Denso or OEN, which happens to be Denso. Aftermarket cats/manifolds work for a few years but the material for the cats is no where near as good as the OEM stuff and they don't last.

Using O2 spacers is basically a band aid for the actual problem. Replace the parts with OEM parts and make sure the rest of the maintenance is up to date on the vehicle.
It’s the v6. I did use aftermarket manifolds/cats with denso 02 sensors. I replaced these 5 years ago, I would have assumed they would last longer then that?
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Old 07-24-2023, 04:04 PM #4
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Quote:
Originally Posted by coolkidd View Post
It’s the v6. I did use aftermarket manifolds/cats with denso 02 sensors. I replaced these 5 years ago, I would have assumed they would last longer then that?
Aftermarket cats can fail within 5 years or less, or you might get lucky and they last longer. OEM cats will most certainly last around 100k miles or more. I've got over 337k miles on my original OEM cats with my V8 and They are just now giving me issues and throwing O2 codes, even with new Denso sensors. I'll be replacing the manifolds with OEM again. Little more expensive but they are proven to work and last longer than the cheaper aftermarket ones.
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Old 07-24-2023, 04:30 PM #5
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I'm all for band-aids in this case. Certainly not putting OEM cats on my rust bucket. I'll be trying the spark plug spacers on mine that has an intermittent p0430.
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Old 07-24-2023, 04:44 PM #6
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321K on 2004 v8 cats
I did get a cat code last winter/spring a couple times below 40 degrees, but it would go away if it warmed up that same day. Guessing there's a small leak I couldn't seem to find, but ordered DT long tubes and a MF Y-pipe. Will most likely be installing headers this fall. Got one of those "Last sets" of DT longtubes I always read about.
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Old 07-24-2023, 05:20 PM #7
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Quote:
Originally Posted by HIMILESV8SPORT View Post
I did get a cat code last winter/spring a couple times below 40 degrees, but it would go away if it warmed up that same day. Guessing there's a small leak I couldn't seem to find, but ordered DT long tubes and a MF Y-pipe. Will most likely be installing headers this fall. Got one of those "Last sets" of DT longtubes I always read about.
Yeah check for the donut leak first. I bought replacements and got the passenger side on first and the stock with 225k miles looked perfect.. but the exhaust donut looked bad. Just barely enough to cause the light to come on. Now I don't know if I should just replace the other and go from there and scrap the OEM cats for cash..
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Old 07-24-2023, 05:27 PM #8
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Quote:
Originally Posted by MikeinNH67 View Post
I'm all for band-aids in this case. Certainly not putting OEM cats on my rust bucket. I'll be trying the spark plug spacers on mine that has an intermittent p0430.
I’m in your camp on this one. Especially now that we don’t have emissions anymore I’m less worried about it. It’s more I’m tired of clearing the codes.
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Old 07-24-2023, 05:40 PM #9
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I’m in your camp on this one. Especially now that we don’t have emissions anymore I’m less worried about it. It’s more I’m tired of clearing the codes.
Exactly, it's hard to tell if there's something really worthy of looking at going on.
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