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Im about to buy a 2017 Alfa Romeo Giulia Quadrifoglio which has been stolen and being sold via auction the car has both keys but the car doesn’t recognise the keys as being present. I feel the theives might have reprogrammed ecu or something - model year 2017. HELP
 

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Might be the batteries are dead. You can put the key fob in the centre console armrest compartment, place it on the alfa logo at the bottom, this should work although I've never tried it.
 

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Giulia Quadrifoglio Feb 2017 Alfa Rosso, Fiat 500e Apr 2021
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or the car's battery is flat?
 

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If you have access to the car, bring an obd adapter (elm327 /obdkey etc) and use alfaobd to have a look and enable them if they are disabled or learn the current keys to the car if they are not known (but if i understand right that must be virgin keys to be able to do so).

Any dealer will also be able to do this, but that will cost you some more.

Off course there is also the possibility of empty batteries in the keys, but then they should be recognised when put in the special key compartment.

If this does not work, looks something really is f*-ed up.
 

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If you get Multiecuscan with the right cables, you can access the RF hub module and check how many keys are programmed. You can then erase and programme new keys. Alternatively any Alfa specialist or dealer should be able to do this using new keys. But first check key fob battery, Car battery, placing it under the arm rest on the Alfa logo, all of which others have suggested.

When the thieves clone a key they add one more and don't usually delete existing keys.
 
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Im about to buy a 2017 Alfa Romeo Giulia Quadrifoglio which has been stolen and being sold via auction the car has both keys but the car doesn’t recognise the keys as being present. I feel the theives might have reprogrammed ecu or something - model year 2017. HELP
Sorry unrelated but what sort of price bracket do these go for? Given how many are stolen perhaps this is a more affordable way into upgrading/ownership :unsure:
 

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When the thieves clone a key they add one more and don't usually delete existing keys.
when you add new key you have to do all of them at once - new and old ones. otherwise those keys which you don't do are either disabled or deleted.
usually disabled keys can be re-enabled. deleted keys usually need specialized equipment like key specialists use.
 

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Giulia Quadrifoglio Feb 2017 Alfa Rosso, Fiat 500e Apr 2021
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@Romeo15907 I suggest you get a copy of MultiECUScan (ideally the multiplex version) which should help with your diagnosis. Details at multiecuscan.net.

Good luck!
 
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