Thanks Doc, appreciated.

I don't think I have the tools necessary to do that. I guess this means certain software, cables etc?

I searched a few european forums and uncovered this (translated from German):

DTC E510 - Missing or invalid security data to PCM

This code can probably occur when the KAM fuse was removed and the key turned in before the engine was started.

-- Below from Polish forum:

DTC#4: "E510" <- U2510 -> Missing or invalid security data to PCM

I know the speedo had been removed due to immobiliser problem. Is it possible to clear stored codes and see if they re-appear?

Edited by 12345oncei on 27/06/2011 at 17:54

Depends on the age of the car, but the instrument unit usually stores all of the codes & some diagnostic info. I'd suggest getting one of the cheap bluetooth OBD readers from Ebay & using the 'Torque Lite' app - this will give live data of engine speed, road speed, throttle position, etc. - If the speed registers on the app & not on your speedo, then assume the instrument panel is faulty & source a unit from your local scrap yard or Ebay - bear in mind that there are several types, ie high & low spec, petrol & diesel, and the mileage on the replacement unit can't be reprogrammed without more complex diagnostic equipment.

If the speed doesn't register on the app, then it's likely to be a speed sensor problem with the unit on the gearbox - this can be a common issue on certain aged Fords, but is pretty cheap & easy to replace.

You can program the remotes of most Fords without diagnostic equipment - make sure your key batteries are good & Google 'Ford remote sync'