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Peugeot 508 DPF warning light power loss

I'm having trouble with my 2022 Peugeot 508 diesel. At 107675 km, a warning light comes on, engine power is reduced, there's smoke during acceleration, and a strong exhaust smell. I suspect a DPF issue; the exhaust pressure seems too low. Has anyone seen this before? Any ideas on what to check?

4 comment(s)

I had similar symptoms with my 508, though I didn't check the pressure myself. Smoke and a strong smell aren't normal. Has the car been serviced recently? Are you doing mostly city driving?

Thanks. The car was serviced about 5000 km ago. I do a mix of city and highway driving, but recently it's been more short city trips. Could that be a factor, maybe with the DPF regeneration? Anything I should know?

Yes, short trips can stop the DPF from regenerating properly, causing a build-up. However, the low pressure reading suggests a faulty sensor. It could also be an exhaust leak before the DPF. Given the symptoms, a workshop visit is a good idea for diagnosis and repair.

Thanks for the advice. I took it to a workshop. You were right, the exhaust back pressure sensor was defective, causing the low pressure reading and other symptoms. The repair was 245€, including parts and labor. Thanks again for your help.

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