Atos NOx catalyst error and exhaust leak

I had a similar issue with my Atos. The NOx catalyst errors often pop up when there are exhaust leaks. Check all the joints and connections in your exhaust system, especially near the catalyst. It might be a small crack or a loose clamp. A leak throws off the emissions readings, triggering the error.

Thanks for the tip! Where exactly should I be looking for these leaks? Is there a common spot on the Atos where they tend to occur? And if it is a leak, is it something I could potentially fix myself, or is it best left to a professional?

The flex pipe and the welds around the catalytic converter are common failure points. Given the NOx catalyst error and the exhaust leak, a professional diagnosis is recommended. A workshop has the tools to properly identify and address the leak. DIY repairs can be tricky and might not fully resolve the issue, potentially causing further problems down the line.

Thanks a lot for your help! I took it to a workshop as you suggested. Turns out there was a crack in the exhaust manifold, causing the leak. They replaced it, and that seems to have fixed everything, cost me about 265€. The check engine light is off, and the error is gone. Really appreciate your advice!