Let’s clear up the confusion immediately. In Renault’s nomenclature, "DF" codes usually refer to specific engine homologations or commercial versions tied to emissions standards (Euro 5, Euro 6).
The fuel pressure regulator directly controls the fuel rail's pressure. This is an electro-mechanical valve, and it can fail in several ways. Internally, its coil can degrade, leading to inconsistent rail pressure modulation. There may be no correspondence between the control current and the actual pressure being generated. df137 renault clio 15 dci link
One or more injectors may be leaking fuel internally, causing a drop in rail pressure. Let’s clear up the confusion immediately
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Using a scanner (like Renault CLIP), monitor the during cranking. If it remains low or at zero, it confirms the pressure regulation failure. How to Fix DF137 Faults its coil can degrade