2016 Range Rover Sport Supercharged 86K miles. (Out of Warranty) is showing the following Code: PCM-Engine Petrol V6
P0089-64 (E Fuel Pressure Regulator 1 Performance -Algorithm based failure-signal plausibilty failure.
What is the real cause of this code?
Is it the Fuel Pump?
OR the Low Pressure and/or High Presure sensor(s)?
How to update the software using GAP Diagnostic?