Rebuilding a 4.6 V8

[Peter@AEW]

I seem to remember something along the lines of- press accelerator pedal to the floor, insert key to switch on ignition. Keep pedal pressed for 15seconds odd, then kill ignition and release pedal.

Or what about disconnecting the battery for an hour or so?

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Thank you for the input.
Have done that already.

Typically disconnect battery for 15 minutes
Reconnect battery and switch key position 2 for 30 sec.
switch off for 30 seconds

switch on to position 2 and start the car.

The message on INPA is accelerator pedal error and I cannot find anything for the 4,6 or 4,4 at present to reset with INPA although I know how to reset a V12.