SofiaWag19

Fluence NOx catalyst aging and exhaust leak

I'm getting so frustrated! I have a 2010 Renault Fluence with a gasoline engine, and the check engine light is on. The car diagnostics say there's an error stored related to the NOx storage catalyst aging. Plus, I can smell exhaust fumes more than usual. I am pretty sure there is some exhaust leaking, any ideas?

4 comment(s)

I had a similar issue with my Fluence. The NOx catalyst is part of the exhaust system that reduces NOx emissions, which are bad for air quality. Did you check for any visible damage to the exhaust pipes or catalytic converter? A leak upstream of the NOx catalyst will definitely trigger that error.

Thanks for the reply! I'm not really a car guy, so when you say 'upstream,' do you mean before the catalytic converter, closer to the engine?

Exactly. Any leak before the NOx catalyst throws off the whole system. Given the error code and the exhaust smell, it's likely a leak in the exhaust manifold or somewhere along the exhaust pipe before the catalyst. Honestly, it's probably best to get it checked out at a workshop. They can properly diagnose it and give you a quote.

Thanks a lot for the advice! I took it to the shop, and you were right, it was a leak in the exhaust system before the NOx catalyst. They fixed it for 265€. Hopefully, that's the end of it!

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