You need to download the small app from bba-reman, copy and paste this url.
http://www.bba-reman.com/content.aspx?content=Test_for_Renault_Key_Immobiliser_failures_emergency_recode
This will calculate the immo bypass code.
Alternatively take ownership docs, keys and proof of identity to Renault dealer, but they will charge you.
vaux
August 2009