The O2 Sensor Bung, available in either mild steel or stainless, is designed for adding an oxygen sensor port to your exhaust system during fabrication or modification. Built from weldable mild steel, this bung is easy to integrate into custom exhaust setups, making it a go-to solution for builders working on performance, off-road, or street applications.

With a standard M18 x 1.5 thread, this bung is compatible with most factory and aftermarket O2 sensors. It can also be paired with an O2 bung plug when a sensor is no longer needed, allowing you to cleanly seal the port without leaving an open hole in your exhaust.

Includes

• (1) Mild Steel or Stainless O2 Sensor Weld-In Bung

Specifications

• Material: Mild steel or stainless
• Thread Size: M18 x 1.5
• Weld-in design for custom exhaust systems
• Compatible with standard O2 sensors
• Can be used with O2 bung plugs
• Easy to weld and fabricate

Fitment

• Universal exhaust fabrication
• Factory and aftermarket exhaust systems
• Off-road vehicles and rock crawlers
• Race cars and performance builds
• LS and LT engine exhaust systems
• Any application requiring an O2 sensor port

Tech Insight

1. What size O2 sensor fits this bung?

This O2 sensor bung uses the industry-standard M18 x 1.5 thread, making it compatible with most factory and aftermarket oxygen sensors used on LS engines, LT engines, performance vehicles, race cars, trucks, and custom exhaust systems.

2. Where should an O2 sensor bung be installed in an exhaust system?

For accurate readings, O2 sensor bungs are typically installed in the exhaust collector or primary exhaust tubing where exhaust flow from the cylinders can be properly sampled. Sensor placement varies depending on whether the sensor is used for engine management, tuning, or air/fuel ratio monitoring.

3. Should I choose a mild steel or stainless steel O2 bung?

A mild steel O2 bung is a great choice when welding to mild steel exhaust tubing. A stainless steel O2 bung is often preferred for stainless exhaust systems because it offers improved corrosion resistance and helps prevent material compatibility issues during fabrication.

4. Can I use this bung for wideband O2 sensors?

Yes. Most aftermarket wideband O2 sensors also utilize the standard M18 x 1.5 thread size, making this bung suitable for EFI tuning, engine management systems, dyno tuning, and performance monitoring applications.

5. What if I remove the O2 sensor later?

If an oxygen sensor is no longer needed, the bung can be sealed using a compatible M18 x 1.5 O2 sensor bung plug. This allows you to maintain a leak-free exhaust system without cutting out or modifying the bung.