Hyundai Repair: hyundai sonata, hyundai sonata, reputable facility

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if you had the right tools could you deprogramme a C.P.U and E.C.U off one hyundai sonata and reprogramme it onto another?

Answer -
If the computers have the same part number, they should be completely interchangeable with no programming needed.  

If the part numbers are different, I suppose it might be possible in some cases, but there would be many factors affecting this, such as whose (what manufacturer's) fuel system is used, the year of the vehicle, etc.  

There's no problem with using a used ECM as long as it's the proper one for the application.  If it isn't, serious consequences could result.

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the units mentioned above don't recognise my ignition. i have been adv the only thing to do is buy a new unit. if i get this new unit is it guranteed to fix the problem ?

Answer -
I'm not sure I understand.

What year is your Sonata?
Which engine do you have?
What do you mean when you say the units won't recognize the ignition?
Who gave you the advice that you new one?

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its a 2001 Y reg 2 litre petrol. i have been adv by hyundai dealers that its the imobiliser and the units no longer recognise the igniton resulting in my car shuting down. i have had a new E.C.U fitted at £600. but this hasnt resolved the problem. i am looking for a second opinion as i am expected to pay for this part which hasn't resolved the problem.  

Answer
If the repair facility is requesting for you to pay for their replacement of a nondefective part based on their diagnosis, that doesn't sound terribly honest to me.  If that's the case, you should definitely take your car elsewhere and not return to that repair facility.  An honest and reputable facility, upon making a mistake, will take responsibility for it.  In this case, that would usually include continuing to look at your car at no additional charge until the actual problem is determined, credit you for any unnecessary repairs, and charge you for the repairs that *were* needed.

As for the Immobilizer, I won't be able to give you much insight because Hyundai didn't use this system in the U.S. prior to 2006.  If it's a system similar to the one we have in the Azera, you'll need to know security passwords to be able to make a used immobilizer work.  I'd suspect that you'll probably need to purchase the Immobilizer module new since there's probably no used ones available with all the password information logged.