DS3 Diesel Power Loss and Smoke

I've got a DS3 as well and I had near enough the same thing happening. Smoke and a real drop in power. Have you checked the backpressure? When the engine light came on I knew something was up.

Could you elaborate on the backpressure assessment? Did you do this yourself, or was it during an inspection? Also, did DPF regeneration have any effect before the engine light?

I didn't check it myself, a workshop did, sorry. No point trying to regenerate if it's completely blocked anyway - they said it was totally choked. Best get it looked at before it causes more damage.

Thanks for the info. It seems a professional diagnosis is needed. Following the inspection, the diagnosis was a defective DPF, with a replacement cost estimated at 1550€.