How to Install a Weld in O2 Sensor Exhaust Bung

Video tutorial on how to how to install a weld in exhaust bung which is typically used for 02 sensor, but can have other uses as well. These exhaust bungs can usually be purchased for a couple dollars at your local auto parts store, this one was purchased from a local exhaust manufacturer wholesaler, along with the rest of the parts as well. I’m redoing the whole exhaust system on this truck which is a 98 Ford Ranger. This truck is equipped with 2 oxygen sensors, therefore it has post and pre cat sensors. The pre is installed on the exhaust manifold and the post is located after the cat which I’ll be installing here. This pipe will be attached to the catalytic converter and there is usually a specific distance where that o2 sensor should be located. For this I am matching the factory distance which was about 6”. I am also taking the expanded portion of the pipe into account which is why you’re seeing me mark the distance at 7.5”. This will also depend on what type of o2 sensor is used. Some are heated, therefore they can be further away. Non-heated sensors require heat from the engine or catalytic converter to function correctly. Keep in mind, when a sensor is too close, it can also overheated therefore creating a premature failure on that sensor.

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