emmalight48

Peugeot 807 NOx Catalyst Aging Exhaust Leak

I have a 2004 Peugeot 807 with a gasoline engine that has done 89711 km. The check engine light is on, with an error code for NOx storage catalyst aging, and I've found an exhaust leak. Could the leak be causing the NOx issue by affecting lambda values?

4 comment(s)

I had a similar problem with my Peugeot 807 (different year). Check engine light, error codes... The exhaust system leak is likely the problem. A leak will mess with the exhaust gas, affecting how the NOx catalyst works.

Did you also have a physical exhaust leak? If so, did replacing the exhaust parts fix the NOx catalyst aging issue, or was more needed?

Yes, it was definitely an exhaust leak causing the problem. I didn't try to fix it myself. I took it to a workshop, and they confirmed the leak.

Thanks for the help. I took it to a workshop, and they found an exhaust leak. Replacing the parts and cleaning the catalyst fixed it. It cost 265€. Your advice helped a lot.

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