Ford Fiesta rainwater finding its way inside the car ending up in the boot as well as under the carpets in the cabin area.
This is a video showing you where the water leak was actually found and where the water was getting into the car - it gets in through the seams around the boot. Possibly the welding is coming loose. It is fixed by sealing and won't need to be re-welded.
This seems to be a common cause of car water leaks on both Ford Focus and Fiesta.
Question: "I had my door apart to fix a water leak, now my electric windows don't work, could water be the cause?"
Answer: It isn't enough to find and fix the leak, you really need to dry the car, otherwise you have a damp environment that cause corrosion and electrical problems. Drying the car is an essential part of the process.
Share this video