<human>:  My car has been making a strange noise lately and I want to know if I need to take it to the mechanic. What could be causing this noise?
<bot>: Possible causes of the strange noise your car is making could include a problem with the engine, a transmission issue, worn brake pads, a loose belt, or a faulty muffler or exhaust system. It is best to have a mechanic diagnose the issue in order to determine the cause and recommend the necessary repairs.