No way of telling you without hearing it and seeing it. Have a trusted mechanic inspect the car for you before you get stuck on the road.
Depends on where the noise is whats making the noise. Can you be more descriptive of where and what?
You haven't by any chance dropped something down a sparkplug hole! Small nut or bolt!
Why is your 1993 Altima Nissan making a clicking noise but does not start?
bad throw out bearing
Your furnace may be making a rattling noise due to loose components, a clogged air filter, or a problem with the blower motor. It is important to have a professional inspect and repair the furnace to prevent further damage.
if it's a turbo check the turbo
Your dryer may be making a rattling noise due to loose or worn out parts, such as the drum support rollers, blower wheel, or belt. It is important to address this issue promptly to prevent further damage to the dryer.
My 1997 Honda CRV is making a rattling noise when driving in rough roads
Inspect the catalytic converter heat shield.
Check to heat-shield at the catalytic converter because something is loose
Your AC unit may be making a rattling noise due to loose or damaged parts, such as fan blades or screws. It could also be caused by debris or dirt buildup within the unit. Regular maintenance and inspection can help identify and resolve the issue.
The rattling noise is in there so you can move the head around.