Yes, an airbag can be replaced. It's important to note since there are those who try to do it anyway, but airbags can't be repaired. They're designed as a single-use item, to be deployed and used up fully during a collision. Once an airbag has been deployed, it can't be repaired, re-conditioned, or re-used as an airbag. While an airbag replacement cost is often quite expensive, you'll have no other choice but to get the airbags replaced completely. Some have also wondered if it's possible to replace airbags DIY-style by themselves at home. Once again, this is a bad idea, as airbags need to be installed and set up properly to ensure that they can deploy reliably in the event of an accident. A person even with extensive technical skills should ideally leave airbag replacements to professionals.