Emobiliser help
 

So went to get in my car from work, it was playing up at dinner tome also (it wouldnt lock) so used the keyhole. So now it wont start due to the emobiloser. How do i reprogram my key or reset the empbiliser. Which ever needs doin. Its a 2004 sti

I dont know the pin code and only have the 1 key!!

Changed the battery but still the same, car needs moving as im.away on holiday tomorro morning