I have the same problem with my 95 Laguna Arrgh!
I went to Renault to obtain the code which cost me £15.I can now start the engine,but it takes a few minutes to put the code in,which you have to do everytime the ingnition has been off for 10 mins.Also my engines tick over is now running that slow that when driving,it often cuts out.
I'm trying to find someone other than Renault to fix the problem,as i dont want to pay through the nose at Renault.
Please let me know if you find anyone?and i'll let you know if i do.Good luck!
Steve Ross
September 2008