Why is airbags light on? on 2008 Dodge Caliber

Owned car 3 yrs airbags light just came on. 171000 miles

Two possibilities..... The clock spring located on your steering wheel is malfunctioning of the wire harnesses under the front seats has been knocked loose from objects under the seats. Check these first and repost if the issue is not resolved.
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I agree with cb30, system can be scanned also.