Citroen Nemo NOx Catalyst Aging and Exhaust Fumes

My 2014 Citroen Nemo (gasoline engine) is throwing a wrench in my plans. Check engine light's on, and the error memory says something about NOx storage catalyst aging. Plus, I think I can smell exhaust fumes more than usual. Anyone else had this?

4 comment(s)

Sounds familiar. I had similar symptoms with my 2016 Opel Astra, although the error code was slightly different. Do you hear any hissing noises near the exhaust when the engine is running? Could be a leak somewhere.

Hissing, huh? I'll have to check that tomorrow. Where exactly should I be listening? I'm not exactly a mechanic, haha.

Around any of the joints in the exhaust system, especially near the catalytic converter. Honestly, though, with those symptoms and that error code, a proper diagnostic at a workshop is probably your best bet. Could be a cracked manifold or something.

Thanks! You were spot on. Took it to the shop, and they found a leak in the exhaust system. Cost me 265€ to fix, but at least the light's gone! Cheers!

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