HOW TO PULL CODES
-Turn the car off
-Find the diagnositics box under the bonnet, its at the rear back of the bay at the firewall. The lid will tell you what each terminal does
-Put your bit of wire between TEN (test engine) and GND
-Put the negative of the LED into FEN terminal
-Put the positive into +B
-Turn your key to ON position, not started, just ON will do
-Observe the codes, maybe take a video with your phone if your new to this, but they will repeat anyway

UNDERSTANDING THE CODES
-First the LED will light for 3 seconds as a check, then it will display any codes stored.
-Long flashes (1.5 sec) indicate the number 10, and short flashes (0.4 secs) indicate the number 1

Translate your codes with this table:

thanks to club323f for the details