95 laguna immobilizer override?

does anyone know how to override the engine immobilzer on my 95 petrol renault laguna. i find it unbeliveable that my only solution is extortionate main dealer fees . there must be a way to by-pass or override what is basically a computer. the electronics where fine i locked then car with the remote came back 30 mins later and remote would not work and engine immobilzer will not cancel . as it is a fourteen year old car i dont want to spend fortunes getting fleeced by renault main agents.