Q: Constang rattling while idling, driving, ect

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Hi, so about a week ago I started my car and it made a very strange sound and something started rattling loudly. It is most prominent when I go over a speed bump or divit in the road or when I am going slower (10-40). However, I have heard it while doing 60. The sound occurs while the car is idling and it can be heard from the inside and outside of the car. Also I closed my car door ( while the car was off) and heard the same rattle briefly. I cannot exactly describe where the sound is coming from when I'm in the car I hear it towards the passenger side under the seats/ slightly in front of the seats. From the outside it sounds like it's coming from the drivers side underneath the car. I am going to get it looked at tomorrow but I'd like have an idea of what it could possibly be before I go. Thank you!

My car has 120000 miles.
My car has an automatic transmission.

It may be from the exhaust or from one of the accessory components like the compressor, water pump or belt tensioner. You may have a bad catalyst in the exhaust. A mechanic like one from YourMechanic would be able to isolate the noise for you and be more precise on location of noise.

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