1. The symptoms you describe are known for the DS4 model with engine code RHE (DW10CTED4) and are caused by a malfunction of the common rail fuel pressure sensor (FRP).
2. To rectify the fault, first perform electrical, mechanical, and component tests to rule out any other potential causes. If no other faults are found, replace the aforementioned sensor, as shown in the image. This should resolve the issue.