when changing out the ecu on a car does the new one need reprogramming? How would it be done

when changing out the ecu on a car does the new one need reprogramming? How would it be done

in all modern cars you must reprogram the computer or it won't start due to anti theft systems. A pass through computer is used and they cost so much, you pay a pro like e to do it, or some bonded locksmiths can do it also

It's a 95

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