Rattling and noisey when driving and also slowing down

do not drive it. have the fault checked immediately. check whether there is oil in your engine. Something may have gone wrong yesterday!!! Driving without soring the problem out could cost you very dear, engines are not supposed to make rattling sounds at all when being driven!!!!!!!!!!!

On that particular vehicle, and is very common, the rear upper strut mount rubbers wear out and cause a rattling noise. The noise is influenced by road conditions and speed and will vary in noise intensity.

The noise could be due to worn universal joint on drive shaft. Could be going bad. Slowly starts as a rattle with a little vibration and over time it gets worse. If there's no propeller type drive shaft, running down the center under the car, then it is something else

Do you think this is an engine noise?

run the fault codes
no fault codes , check for loose mud flaps , trim , wheel trim etc

replace the sending unit if the pressure was low the engine would be noisey

check exhaust for loose clamps or ring that rots off flex pipe and is noisey , good luck.

Have the tires inspected for a stuck stone or metal object. The anti-roll bar may have lost one of it's rubber bushings where it connects to the suspension on that side. A shock absorber may have lost a rubber bushing.

because waterpump is not leaking doesnt mean its not noisey.could have bad bearing thats noisey. remove belt and spin by hand see if you haer any noise and see if loose.