The manufacturer of the car. The onus is on them to then seek recompense from their supplier.
When you buy a product, you buy from a distributor. The various companies that contributed to that product are not relevant.
Imagine having a bad meal at your favourite restaurant. Do you find out who supplied the ingredients and complain to them?
But when the car manufacturers buy a component, it***8217;s like you buying an item in the high street, when the warranty is up its up
I would imagine that Renault are as pi55ed off at the defective part that you have been supplied as you are. It's their reputation on the line, not that of the supplier
EDIT ~ Oh sorry, you don't have a Scenic II, but I'm sure you get my drift