My car rattles when someone seats in the back passenger or when I push down the car trunk. The sound is coming from the back portion of the car.
Any idea what would be the problem?
Car: Honda City 2003 A/T
This noise could be from any part of the car on some type of flexible mounting : suspension parts or even the exhaust. Another possibility is that there is a loose bolt or screw in a cavity under the seat for example (had that and a so & so to find...). updated after your edit.