Ok this is like one of those toothaches where you dont know wich tooth hurst , i get this very low rattle noise on the back of the passenger side its driving me nuts cant pin point it i dont think its from the engine sounds like a loose plastic part very annoying sound , by the way its a 07 C4S cab

 

I noticed a rattle by our heads in both my 997 and my friends. Its the seat belt housing on the b pillar for me.

 

I had some noise from the rear as well, and it turned out that one of the catch on the rear passenger seat was slightly loose. You might want to check that the seats are set flush against the back.

 

Under the seats? I had four AAA batteries stuck beneath the carpet that drove me nuts for a while.

 

thanks guys will check the above places ,

 

Have a rattle (some kinda noise) under the dash by the glove box. Erg!

 

Is the right rear seat locked? My rear seat was upright and looked OK, but the metal lock mechanism was not seated properly, causing a noise.

 

Thanks problem solved PSPORSCHE dead on my seat was not seated properly