Code for Nissan Micra SX 2003 please help!!?

Hi

I have a similar problem. I have also searched everywhere to find the code for my Nissan Micra SX 2003 model but can't find it. I am desperate to avoid going to Nissan as I really can't afford to pay £40 and am currently trying to sell my car!

My garage has looked at it and has given me the serial number and details below.

Can anyone help with the right code?

BP234631949952
Nissan MM Co-K
7642 346318