how can I fix my 1995 renault laguna?

Do you have the drivers handbook?
Also, look through any paperwork you got with the car to see if the previous owner has written down the immobiliser by-pass code (4 digits).
If you have the handbook it's easier to take you through some checks.
If the key wont work in any of the locks it's possible the PO has changed the ignition barrel and key.
Do you have any spare keys?
Was there heavy rain or was the car washed just prior to this problem?
Have you put new batteries in the remote?
Check the key is working by pointing it at the lens of a phone camera (camera switched on obviously).
Push the button on the key and you should see a flash on the camera screen from the infra red sender in the key. No need to take a picture.
The key may simply need re-synched.

bored at work
September 2009