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V50 Exhaust Treatment Malfunction

My 2005 Volvo V50 with a gasoline engine is showing an exhaust treatment malfunction at 195472 km. The check engine light is on, and the engine runs rough. I've also noticed an exhaust leak and a strong exhaust smell. I suspect a defective lambda sensor. Any thoughts before I start swapping parts?

A 2005 Volvo V50 with a gasoline engine is experiencing an exhaust treatment malfunction, indicated by a check engine light and rough engine performance, along with an exhaust leak and strong smell. The initial suspicion is a defective lambda sensor. After diagnostics, it is confirmed that the lambda sensor is indeed faulty, leading to its replacement.

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4 comment(s)

Rough running and a strong smell point to combustion issues. That leak could be anywhere in the exhaust pipe. Could be pre-cat, post-cat or even the cat itself gone bad. Have you checked for any obvious damage to the exhaust pipe or catalytic converter?

Thanks for the quick response. I visually inspected the exhaust pipe and catalytic converter but didn't find any obvious cracks or holes. What are the chances it could be something like NOx sensors or the particulate filter causing these symptoms?

NOx sensors usually trigger specific codes, and your description sounds more like a primary combustion/lambda issue than a NOx problem. Particulate filters are more common in diesels. Given the age and symptoms, a faulty lambda sensor is still a prime suspect. But honestly, without proper diagnostics, you're shooting in the dark.

Appreciate the confirmation. I took it to a workshop for diagnostics. You were right, defective lambda sensor. Repair cost 375€. Thanks for the help!

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VOLVO

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V50