alexanderlehmann1

Corolla NOx Catalyst Aging Exhaust Leak

Hi, I have a 2019 Toyota Corolla with a gasoline engine. My check engine light is on and the error memory says something about NOx storage catalyst aging. Also, I smell exhaust leaking. Car has 65238 km. Any ideas?

A 2019 Toyota Corolla owner reported a check engine light with an error indicating NOx storage catalyst aging and an exhaust leak smell. The issue was suspected to be an exhaust system leak, potentially near the NOx catalyst. It was advised to inspect the exhaust manifold and pipe leading to the catalyst, and a smoke test was recommended for accurate diagnosis. The problem was confirmed as a small crack in the exhaust, which was subsequently repaired.

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4 comment(s)

Sounds like a potential issue with your emissions system. Given the NOx catalyst code and exhaust smell, I'd guess you have a leak somewhere in your exhaust system before or near the catalyst. Have you checked for any obvious cracks or damage?

Thanks! I had a quick look but didn't spot anything obvious. Is there a specific area I should be focusing on?

Leaks can be tricky to find. Given the error code, pay close attention to the exhaust manifold and the pipe leading to the NOx catalyst. But honestly, with emissions stuff, best to get it properly smoke-tested at a workshop to pinpoint the exact location. It could be a small crack.

Turns out you were right, a small crack in the exhaust. Workshop confirmed it and replaced the section. Cost me 265€. Thanks for the help!

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TOYOTA

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COROLLA