levighost74

Peugeot 407 exhaust pressure issue

I have a 2005 Peugeot 407, diesel engine, with 55280 km. Recently, a warning light appeared with reduced engine power and smoke when accelerating. There's also a strong exhaust smell. I suspect a particulate filter issue. Could it be related to exhaust pressure?

4 comment(s)

That sounds familiar. I had similar symptoms with my old Volvo – though the engine was petrol. It turned out to be a faulty sensor causing the DPF to think it was blocked. Has the car had a forced DPF regeneration recently?

I am unsure about forced regeneration, I bought the car recently. Could a defective sensor really cause all these issues?

Yes, it can. The sensor provides readings to the ECU, which then controls fuel injection and regeneration. If the sensor is faulty, the ECU receives incorrect data, leading to the described symptoms. But, I'd recommend getting it professionally diagnosed; could be something else but the sensor is the most likely culprit.

Thank you for your input. It was indeed the exhaust back pressure sensor. I replaced it for 245€ at a local workshop and the car runs like new.

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