Connect an OBD2 scanner compatible with Renault vehicles (such as Clip, iCarsoft, or PyClip). Clear the code, cycle the ignition, and see if the DF045 code returns immediately as a "present" or "stored" fault. Step 2: Test the Glow Plugs Turn off the engine and remove the plastic engine cover.
In plain English: the central computer (UPC or UCH) has lost reliable communication with the instrument cluster (your speedometer and warning light panel) via the (Controller Area Network). df045 renault scenic