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ECU swap on a 2000 Avensis


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Hello all

I am wondering if anyone knows what problems I will encounter if I try to swap my existing ECU for a second hand unit.  My unit has the following part numbers 

ENGINE CONTROL 7A-FE     * 1757009314 *     89661-05220     MB175700-9314 

If I use a second hand ECU with the same part numbers will the software be an exact match, accessories, transmission and the like. Does every software revision have a differant part number. 

Does this Toyota ECU have a VIN identity, can it be overwritten.

Can I recode my existing keys to the new ECU

Can I use Techstream UK to reprogramme the ECU on a car of this age. 

Sorry to be a pain, I have tried to answer my own questions, the internet is full of conflicting information on this subject so I thought it best to consult the community. 

Thanks in advance

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