Testing immobiliser on a mk2/2.5 focus

[bigup]

Hi all

so I'm after a spare key fob/key for my 2010 focus and just ordered one from eBay ; http://www.ebay.co.uk/itm/291822367403?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

the aim is to buy it and get an auto electrician to cut and programme it to my car.

this got me thinking about the immobiliser in my current key fob. I opened it up and only saw the battery and little circuit board.

whilst the button part was separated from the blade part, I used the key part to open the door of the car manually and started the car fine.

the 3 button part of the key fob was in my other hand.

where exactly is the transponder for the PATs system in the key fob? 

I have a normal flashing PATs red flashing LED on my dash board and alarm works fine, I've gone into the test menu on my dash and shows no DTC codes  

how can I fully test the immobiliser? Do I need to leave the button part of the key fob indoors and try starting the car with just the key blade part?

Just want to make sure PATs is is working fine

hope that made sense !

thanks.

[dezwez]

the   transponder  is in the key bit 

[bigup]

9 minutes ago, dezwez said:

the   transponder  is in the key bit 

That explains it :)

will the key I bought from eBay be ok for the spare ? (Once I get it programmed up)

thanks mate. 

[dezwez]

if its the same cut as yours and programmed  up right  yes