There are a number of reasons for this. Power steering fluid won’t evaporate so if it’s low it had to leak. It may leak from the pump or the steering gear or even the high pressure hose that runs between the two. You should have a certified technician inspect the system to get a diagnosis and a repair plan. It’s important to have this checked right away, if the system is run low on fluid it can damage other parts as well, and that turns into a larger repair bill.
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