I have a 2013 Ford Fiesta and I can hear very loud squeaking sounds from the rear underside of the car when I drive over speed bumps or road pot holes. It sounds like seat springs being depressed but seems far too loud for that. My local garage tell me that it is probably the front D bar rod scraping on the adjacent metal due to the deterioration of its rubber enclosures. I don't have confidence in this conclusion as the sound comes from the rear and not the front.

Does anyone have any idea what this could be caused by please or might the garage's conclusion be feasible? 

As it sounds (pun, geddit?) like it needs fixing, I assume they put it on the ramp and showed you the (what I suspect) will be an obvious fault?
If not, what was the point of guessing?
Get someone to show you, they get the work, you get the quiet car?

1 hour ago, Verve said:

I have a 2013 Ford Fiesta and I can hear very loud squeaking sounds from the rear underside of the car when I drive over speed bumps or road pot holes. It sounds like seat springs being depressed but seems far too loud for that. My local garage tell me that it is probably the front D bar rod scraping on the adjacent metal due to the deterioration of its rubber enclosures. I don't have confidence in this conclusion as the sound comes from the rear and not the front.

Does anyone have any idea what this could be caused by please or might the garage's conclusion be feasible? 

Has this garage put it on a ramp and looked?

My first guess would be a broken rear spring.  Modern car springs seem to break quite often - are you able to look underneath properly yourself?

If not, just looking at each side of the car, is that gap between tyre-top and wheelarch the same on both sides?

Thank you both for your replies. My garage had the car up on a ramp and they showed me around. They said the rear suspension springs were ok and I could not see any problem. I could see the deterioration of the rubber enclosures of the D bar rod which is at the front of the car. As a process of elimination, I have instructed that the D rod rubber enclosures be replaced and see what that does. I will keep you posted.

i had a similar noise, turned out to be the big rubber bushes in the back axle, renewed and the noise went away, car even handled much better.

Hello everyone. Sorry about the delay coming back but I have only just received notification that someone has replied. As it happens, I took the car in to my local garage and they had it up on a ramp and told me the noise was coming from the front track rod bearings where the rubber enclosures had deteriorated. I suddenly lost faith in my garage because I was convinced the noise was coming from the rear of the car, but agreed to them replacing the rubbers and low and behold, the noise has disappeared.