I would suggest contacting the original dealer who would know what the code is (assuming you don't have the code card in the folder with the service book and owners manual).
If a previous owner has personalised the code there is no chance of resetting it (thats the situation I had).
There is someone on here that knows how to find the original code, but again if someone has changed it from the original code, theres the problem.
I believe the factory default setting is 0000