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I have read this is a common irritation among 996 owners. I kept hearing this random vibration type rattling from behind my drivers position, especially on rough roads. You know how sounds like this are, for the life of you, it's impossible to track down...and seems to move! With the help of this forum, I pinned it down to the transverse bar/rod going from the hanger hook to hanger hook under the headliner. When I put pressure on it, it goes away.
Does anyone have a trick or technique to fix this problem without undoing the headliner? Maybe a foam pad inserted with extra long forceps or something thru the opening in the sunroof?? I'm sure I'm not the only one wanting to know this.
If you want it done right you should probably remove the headliner and fix it. Perhaps you can upgrade to an Alcantara headliner in the mean time.
Alternatively, there is always some sheet metal screw and a drill around the garage.
A chassis stethoscope would be the correct tool. Wear the headphones, drive over the rough road,get your wife(she is still in the back?) to move the stethoscope around to pinpoint the source of noise. If you are very limber, you may be able to move the 'scope around while driving?
Search the web for "Chassis ear" or "engine ear"
Its the headliner support poles, rattling against the roof right at the rear by the rear screen, there are a few posts on here, its a super easy 30 minute fix.
I put up with it for 18 months thinking it was a nightmare to remove a headliner and the risks of damaging it. Couldnt have been more wrong, its easy, simple and now the cars is a joy to drive over bumpy roads and you can open you sunroof without that annoving rattling
