Range Rover L322 TDV8 4.4 - P0088-17. Extreme restricted performance.

After I broke the fuel pressure sensor changing the oil cooler and thermostat housing my L322 has shown this error putting it in extreme restricted performance. P0088-17 - Fuel rail/system pressure - too high - General electrical failure - circuit voltage above threshold (68). I tried to fix it myself. But failed and handed it over to Venture 4x4. It was quite expensive. It now needs to get us to the Alps and back. Fingers crossed..