About the HDC,,,you know that it must be in LOW for it to work do you?... if yes and it was in low it's possible that the hi/low switch to not work or to have a contact issue so the ECU doesnt get the earth input even though it is mechanically selected
about the ACE, make sure you have serious activity in the tank with engine running first then check if the solenoids and pressure transducer are well connected and if nothing obvious by eye you need to plug in a tester for the fault code
Discovery Td5 (2000), manual, tuned
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