marieschaefer2
Citan NOx issues
Summary of the thread
A 2022 Mercedes Citan with a gasoline engine exhibited a check engine light and error codes related to NOx storage catalyst aging at 32,800 km, alongside an exhaust leak. The exhaust leak was suspected to interfere with oxygen sensor readings, affecting the emissions system and fuel efficiency. A professional inspection confirmed the exhaust leak, which was repaired, resolving the issue.
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4 comment(s)
marieschaefer2 (community.author)
Yes, fuel efficiency seems slightly reduced. Regarding the exhaust system leak, where was the leak on your Astra?
hansrichter1
Mine was at the flex pipe, a common failure point apparently. Since you have exhaust leaking and NOx errors, I'd strongly suggest getting the exhaust system checked professionally. It could save you money in the long run and is better for air quality anyway.
marieschaefer2 (community.author)
Thanks for the insight. I took it to a workshop, and it was indeed a leak in the exhaust system. Repair cost 265€. Problem solved.
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MERCEDES
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CITAN
hansrichter1
I had similar problems with my emissions system on a 2018 Vauxhall Astra, although not the exact same error. An exhaust leak can definitely mess with the readings from the oxygen sensors and throw off the whole emissions system. Has your fuel efficiency taken a hit? Is the smell of exhaust stronger than usual?