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Downsteam O2 sensor bung size; Gotta plug a bung hole
Topic Started: May 2 2014, 10:04 PM (581 Views)
LeoGeo
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Ordered a new cat for my 95 and it arrived with a bung port for a downsteam O2 sensor. I just need to know what size & thread the downsteam bung is. I found a M18x1.5 bolt on ebay but i'm not sure it'll fit. Does anyone know of a local source for bolts of this size? Hardware stores have been a strikeout so far.

--edit--

Turns out they are readily available for about $3 at most auto parts stores. Just needed to search for "m18 plug" M18x1.5 fits perfectly
Edited by LeoGeo, May 11 2014, 05:20 PM.
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Hotrodray1
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Over Educated parts guy

If all else fails pick and pull old o2 clip wires and install.
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JellyBeanDriver


Junkyard O2 sensor? Or an old one you have laying around?
Might be easier to find than a bolt.
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Metromightymouse
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Powdercoat Wizard

Might check and see if any spark plugs you have kicking around fit it as well.
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91 ragtop
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Most sparkplugs are 14mm. I think the bung is 18mm but I'm not sure of the pitch. I'll go and see if I can find my bunghole thread chaser.
Yep! It's a 18x1.5


Ken..........
Edited by 91 ragtop, May 4 2014, 10:29 AM.
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Joe Dirt
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18mm o2 plug, old o2 sensor , 13/16 spark plug (18mm) or weld it up
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Cyborg
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McDumbass

i pull the pipe off, welded a plate over the hole and zip tied the sensor to the car.
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cwatkin


The M18 plugs can be bought in the automotive hardware (drain plugs) at most farm and home type hardware stores. A big store like Lowes or Home Depot probably will be a no go but a small rural store will be a better bet. I have bought these for this exact purpose. I had an older carbed Jeep and all the exhaust manifolds you can find currently have the O2 sensor hole so I needed to plug this up.

Conor
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