I would suggest you get the water ingress problem in the fuse box sorted first. This can cause voltage variations in the electrics and belive you me Renaults do not take kindly to such variations nor will any diagnostic equipment.
This is all part of the problem.
The car was crashed by its previous owner and none of the cladding was put back in hence everything under the bonnet gets soaked when it's driven in the wet.
By the time i have all the cladding replaced and the throttle pediometer sorted the cost is going to be very high.
It wasn't a great job done fixing the car, i believe it has been clocked as well. Bad experience with my Renault! Oh well you live and learn i suppose.
The garage was taking all this into account when they said get rid of it as it isn't worth spending on