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It can only be an immobilisor key,haven't seen one exactly like that before but most only have three contacts like that.If you open it you'll probably find a small microchip inside,or if it's REALLY cheap them maybe even just a resistor.

Does it look like there has ever been some sort of receptacle on the dashboard that it could have plugged into?

Chris.
 

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Discussion Starter · #9 ·
Cant see anything on the dash but on another forum I use someone messaged me this:

In modern cars when the ECU (engine management system) has been replaced, they come with a device similar to your 'stick', that is used to prime the sub management systems (engine settings, ABS, suspension, engine sensors etc...)when the replacement ECU is first powered up by a computer. (your little stick is plugged in to the dealers computer)
 
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