Mercedes GT Roadster NOx emissions problem

Whoa, sounds familiar. I had almost the exact same headache with my GT Roadster, gasoline engine. Check engine light, the whole shebang. That NOx storage catalyst aging error is a pain. An exhaust leak could definitely be the culprit. Think of it like this: your exhaust system is supposed to be a closed loop, right? If there's a leak, it throws off the whole balance, messing with your catalytic converter's efficiency and causing all sorts of wonky readings, including your NOx emissions. Did you try any quick fixes yourself before diving into car diagnostics?

That's a great analogy. No quick fixes yet, besides clearing the code, which came right back, of course. Where exactly was the leak in your exhaust system when you had the NOx emissions issue? Was it obvious, or did you need to hunt for it?

Alright, so clearing the code didn't work. That's usually how it goes. The leak itself wasn't super obvious at first, but I took it to a workshop anyway. They used some kind of smoke test to find it. Apparently, there was a small crack in one of the exhaust pipes near the catalytic converter. Cost me about 265€ all-in to get it fixed. Honestly, with those NOx emissions errors and the exhaust leak, it's probably best to bite the bullet and get it checked professionally. Could save you a ton of money in the long run, avoiding potential damage to the catalytic converter.

Thanks a million. I appreciate the insight. Sounds like a trip to the workshop is definitely in order. The price you mentioned gives me a good ballpark figure too, so I won't be completely in the dark. I'll let you know once I get it sorted. It turned out that the garage confirmed the exhaust leak which was causing issues with the catalytic converter, they welded it and reset the error codes. Now everything is working perfectly.