Hi, I had a similar problem with my 2014 Citroen C4. I would classify my car knowledge as average. After a few troubleshooting sessions at my garage, it was found that the DPF was severely overcharged. We cleaned and replaced it, and it cost me 1325 euros. Can you please provide the exact vehicle details? Then I might be able to tell you more. I hope that helps you.

(Translated from German)

Sure, thanks for your answer. My car now has 77817 km on the clock and the last service was about 3 months ago. The car has never let me down, so this check engine light surprised me a bit. Did you have the problem again after the repair?

(Translated from German)

Hey, thanks for the details. My C4 had around 80,000 km on the clock when I had the same problem. After the DPF was renewed, I no longer had a check engine light or any problems with loss of engine power. With DPF regeneration, it is extremely important that the process is carried out correctly, otherwise it can be more expensive in the long run. If your Citroen also has a similar problem, I would recommend that you get this checked soon. It's always better to make sure everything is in order, especially if you drive often. Hope this helps!

(Translated from German)

Thanks again for your help. So it seems that the DPF is to blame. I will definitely have it cleaned and hope that this will prevent a recurrence of the problem. Your experience was really helpful. I will make an appointment at the workshop as soon as possible. Stay healthy!

(Translated from German)