Hi all, Longtime lurker with first post. I own a late-2009 XC90 purchased used in 2011. I love this car but it has been neglected and abused due to some health and family circumstances (more on that in another thread). I know this has been covered well elsewhere, but thought I'd relate my recent exp...

In 2019 my rear catalytic converter assembly rusted out and got very noisy. The braid around the flex pipes was very degraded, and the flex pipes themselves were in bad shape with small leaks. There were also a few leaks on the hard pipes downstream. One of the flex pipes: Flex.png Support bracket r...

Fast forward to 2022, and my repairs are starting to leak again. I'm also getting the following codes related to my rear O2 sensor in Bank 1: ECM-P013700 02 Circuit Low Voltage (Bank 1, Sensor 2) ECM-P227000 02 Sensor Signal Stuck Lean - Bank 1, Sensor 2 I used VIDA to plot the O2 sensor voltages, a...

The front catalytic elements still seem fairly clean:

Although I'm not completely sure how a degraded converter would present.