Laguna starting problems

[crunchypants]

I was recovered by the AA on Friday after my Laguna stopped on my way home from work

The AA Patrol man did his usual stuff when he got there and diagnosed the problem to be a faulty crankcase sensor using his laptop plugged into the car

I got a new sensor today and fitted it but the problem is still there and it wont start

Is there something else I need to do, does the engine management system need to be reset and is this something I can do or do I need a renault specialist

The car is a 2000(W) 2ltr 8valve sport, the last of the old shape