wernersky11

Fiat 500 Exhaust Treatment Malfunction

Esteemed Fiat community, I come to you today with a perplexing issue concerning my 2022 Fiat 500, equipped with a gasoline engine. At approximately 25655 km, I've encountered an exhaust treatment malfunction. The telltale signs include the check engine light illuminating intermittently, a noticeable rough engine running, an exhaust leak that I can hear, and a disturbingly strong exhaust smell emanating from the vehicle. My initial diagnosis points towards a potential lambda sensor defect, possibly impacting the particulate filter or catalytic converter. I have visually inspected the exhaust pipe for obvious damage, but haven't been able to pinpoint the leak. Has anyone experienced a similar issue, and if so, could you offer any insights into potential causes or troubleshooting steps?

A 2022 Fiat 500 owner reported an exhaust treatment malfunction, characterized by a check engine light, rough engine running, an exhaust leak, and a strong exhaust smell. The initial suspicion was a defective lambda sensor affecting the particulate filter or catalytic converter. A suggestion was made to inspect the exhaust system for leaks, particularly around connection points. The issue was confirmed to be a faulty lambda sensor, which was subsequently replaced, resolving the problem.

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4 comment(s)

Engine light on with those symptoms? Sounds rough. Exhaust leak plus smell is not good. Could be sensor, could be exhaust system. Check for black soot around any joins in the exhaust.

Thank you for the swift response. When you mention "joins in the exhaust", are you referring specifically to the connection points between the exhaust manifold, catalytic converter, and the exhaust pipe leading to the rear of the vehicle? Or are there other areas I should be inspecting for potential leaks? Furthermore, would a defective lambda sensor invariably trigger the check engine light, even if the catalytic converter is still functioning within acceptable parameters?

Yeah, all those connection points. If the sensor is bad it will throw a code. A garage will pinpoint it quickly. Get it checked before it damages anything else.

I appreciate your advice. I've heeded your recommendation and taken the vehicle to a reputable workshop. The diagnosis confirmed a defective lambda sensor, necessitating a replacement. The total repair cost amounted to 375€. Thank you for pointing me in the right direction; your assistance was invaluable.

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FIAT

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500