Citroen C4 diesel particulate filter pressure too low

Hey, I had a similar issue with my Citroen C4, though it was a petrol engine. Low pressure and reduced power sounds familiar. Has the issue appeared suddenly, or has it gradually worsened?

Thanks for your input. The issue appeared quite suddenly. One day the car was running fine, the next day the warning light was on and the power was noticeably reduced. Is this similar to what you experienced?

Yes, the sudden onset is exactly what I remember. Given that, and the error code you mentioned, it really does sound like the pressure sensor. If I were you, I would take it to a workshop to have it properly diagnosed and repaired.

Thanks for the advice. I took it to the workshop as you suggested. It was indeed the exhaust back pressure sensor. The repair cost me 245€. All the symptoms disappeared after the sensor replacement.