O2 Sensor Bung Kits

Select your vehicle to see O2 Sensor Bung Kits that fit

O2 Sensor Bung Kits: the weld-in threaded port your sensor screws into

An O2 sensor bung is the threaded fitting you weld into an exhaust pipe or manifold so an oxygen sensor has a home. When you add a wideband gauge, relocate a factory sensor, or build a custom exhaust or turbo manifold, you need a fresh port cut and welded in at the right angle. That is what o2 sensor bung kits give you: a machined bung with matching threads, and usually a plug to seal the hole when no sensor is fitted. Get the thread pitch and the placement right and the sensor reads clean; get it wrong and you fight leaks and bad data.

What ThreePiece stocks

This is a focused category. We currently list 4 products across 3 brands - Innovate Motorsports, AEM and Vibrant - with prices running from $28 to $34. That is the live range for what is in stock right now, not a standing promise. These are universal weld-in parts, so the range is built around thread and material choices rather than a specific vehicle.

How to choose

Two things decide it: thread and material. Match the thread to your sensor - the Vibrant is spelled out as M18 x 1.5, and the Innovate kits are listed as 1/2 inch, so confirm which your sensor uses before you order. On material, mild steel like the Innovate 3735 is the cheaper route and welds easily to mild-steel piping; the stainless options from Innovate (3736), AEM and Vibrant suit stainless exhaust work. The Vibrant's heat-sink design is worth a look if you want to pull heat away from the sensor body. All of these are weld-in, so you'll need access to a welder or a shop.

What else you need with it

A bung is one piece of a wider build. If you're plumbing an exhaust or feeding a gauge, browse Fittings (634 products) and Adapters (699 products) for the connections around it. Engine builds that put you in here often also need Gasket Kits, Head Gaskets and Fuel Pumps. For cooling and filtration on the same project, see Radiators and Oil Filters. The full Engine Components section ties it all together.

Fitment help and ordering

None of these listings carry vehicle-specific fitment data - they're universal parts - so match by thread and material rather than year, make and model. If you're not sure which thread your sensor uses, call our fitment help line at 813-535-5801. Every order ships with free shipping, and Affirm financing is available at checkout if you'd rather spread a larger build - see financing for details, or reach us any time through contact us.

O2 Sensor Bung Kits: the weld-in threaded port your sensor screws into

An O2 sensor bung is the threaded fitting you weld into an exhaust pipe or manifold so an oxygen sensor has a home. When you add a wideband gauge, relocate a factory sensor, or build a custom exhaust or turbo manifold, you need a fresh port cut and welded in at the right angle. That is what o2 sensor bung kits give you: a machined bung with matching threads, and usually a plug to seal the hole when no sensor is fitted. Get the thread pitch and the placement right and the sensor reads clean; get it wrong and you fight leaks and bad data.

What ThreePiece stocks

This is a focused category. We currently list 4 products across 3 brands - Innovate Motorsports, AEM and Vibrant - with prices running from $28 to $34. That is the live range for what is in stock right now, not a standing promise. These are universal weld-in parts, so the range is built around thread and material choices rather than a specific vehicle.

How to choose

Two things decide it: thread and material. Match the thread to your sensor - the Vibrant is spelled out as M18 x 1.5, and the Innovate kits are listed as 1/2 inch, so confirm which your sensor uses before you order. On material, mild steel like the Innovate 3735 is the cheaper route and welds easily to mild-steel piping; the stainless options from Innovate (3736), AEM and Vibrant suit stainless exhaust work. The Vibrant's heat-sink design is worth a look if you want to pull heat away from the sensor body. All of these are weld-in, so you'll need access to a welder or a shop.

What else you need with it

A bung is one piece of a wider build. If you're plumbing an exhaust or feeding a gauge, browse Fittings (634 products) and Adapters (699 products) for the connections around it. Engine builds that put you in here often also need Gasket Kits, Head Gaskets and Fuel Pumps. For cooling and filtration on the same project, see Radiators and Oil Filters. The full Engine Components section ties it all together.

Fitment help and ordering

None of these listings carry vehicle-specific fitment data - they're universal parts - so match by thread and material rather than year, make and model. If you're not sure which thread your sensor uses, call our fitment help line at 813-535-5801. Every order ships with free shipping, and Affirm financing is available at checkout if you'd rather spread a larger build - see financing for details, or reach us any time through contact us.