I have just purchased a replacement catalytic converter.
Using a flashlight, I can see the catalytic material inside the converter. When I was inspecting it, it looks like both the upstream and downstream o2 sensors are on the same side of the catalyst material inside. The exhaust gas would go past the upstream o2 sensor, then past the downstream sensor and then pass through the catalytic material, and then out the tailpipe. There is nothing at all between the 2 o2 sensor locations.
Is it possible that the catalytic converter part was welded in backwards?
It seems different than what I was expecting. I was expecting the upstream o2 sensor to be on one side of the catalyst and downstream o2 sensor to be on the other side so that they would measure the difference between the pre-converted exhaust gas and the post converted gas. I have attached a photo to help illustrate what I mean.
- 2007 Ford ranger
- Engine: 4.0L v6 SOHC
It has a catalytic converter on each bank of cylinders. Each cat has an upstream and downstream sensor. This is the left (drivers) side.