Citroen C5 brake booster pressure sensor issue

I had a similar issue with my Citroen C5 some time ago. Same symptoms: error message and weak braking. In my case, the ABS system was involved. Did you check the hydraulic brakes?

Thanks. Could you elaborate on which component of the ABS system was the problem? I'm trying to narrow down what it could be.

I can't recall the exact component, but the workshop mentioned the brake booster pressure sensor and the ABS module needing recalibration. Given your symptoms and the diagnostic code, it's likely the same issue. I recommend visiting a workshop with diagnostic tools.

Thanks for the advice. It was the brake booster pressure sensor, and it was due to incorrectly bled brakes, as suspected. The repair cost 90€. Appreciate your help!