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Peugeot 407 diesel crankcase ventilation issue

Peugeot 407 (2005, diesel) with 235067 km. Check engine light, reduced power, and smoke when accelerating. Suspect crankcase ventilation valve. Anyone experienced this?

A Peugeot 407 diesel is experiencing issues such as a check engine light, reduced power, and smoke during acceleration, suspected to be related to the crankcase ventilation valve. These symptoms, along with rough idling and a hissing sound, suggest a defective crankcase ventilation system. A similar case confirmed the crankcase ventilation valve as the cause, and a workshop diagnosis verified this, leading to a repair quote.

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4 comment(s)

I've got a 407 diesel too. Those symptoms sound familiar. Had a similar issue a while back. Any rough idling or hissing sounds?

Rough idling sometimes, yes. And now that you mention it, I think I did hear something like a hissing sound recently. Was it definitely the crankcase valve for you?

Yep, that's exactly what it was. Ended up being a defective crankcase ventilation. I'd suggest getting it checked out by a workshop.

Thanks a lot! Shop confirmed it was the crankcase ventilation valve and quoted 360€ for the repair. Appreciate the help!

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PEUGEOT

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407