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Peugeot 3008 exhaust treatment malfunction

Hi. I have a 2021 Peugeot 3008 gasoline engine. I'm getting an exhaust treatment malfunction warning. The check engine light is on, the engine is running rough, and there's a noticeable exhaust leak with a strong smell. I've checked the fuel cap, but it looks OK. Any ideas?

4 comment(s)

I had something similar with my 3008. Check engine light, rough running. It could be a faulty lambda sensor. Are you noticing any issues with DEF fluid levels?

DEF fluid seems normal. Where is the Lambda sensor located? Is it easy to check?

It's near the catalytic converter. Honestly, unless you're really comfortable with car repairs, I'd suggest taking it to a workshop. A defective lambda sensor can cause serious issues, and an exhaust leak isn't something to ignore. The NOx sensors might also be involved.

Thanks for the advice. I took it to a workshop, and it was indeed the lambda sensor. Cost me 375€ to get it fixed. Appreciate the help!

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