jasmineis3

Elantra NOx Catalyst Aging

Hey, got a prob with my 2018 Hyundai Elantra, gasoline engine. Check engine light is on, and the computer says something about the NOx storage catalyst aging. Plus, I think I smell exhaust fumes more than usual. What gives?

A 2018 Hyundai Elantra owner experienced a check engine light and increased exhaust fumes, with a diagnostic indicating NOx storage catalyst aging. The issue was likely caused by an exhaust leak, which can disrupt oxygen readings and affect the catalytic converter's efficiency. The problem was confirmed to be a small crack in the exhaust manifold, which was repaired, resolving the issue.

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4 comment(s)

Sounds like a potential exhaust leak, which is common and can affect the NOx catalyst. Is the car's fuel efficiency lower than normal? A leak upstream of the catalytic converter can definitely trigger those NOx emissions errors.

Lower fuel efficiency, huh? I hadn't really paid attention. So, a small leak can mess with the whole NOx catalyst thing? How does that even work?

Yep, even a small exhaust leak throws off the oxygen readings, messing with the catalytic converter's efficiency and NOx conversion. With those symptoms and the error code, I'd bet money on a leak somewhere. Time for a workshop visit, I think.

Thanks! You were spot on. Took it to the shop, and it was a small crack in the exhaust manifold. Cost me 265€ to get it fixed. All good now!

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HYUNDAI

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ELANTRA