What are the most common causes of an airbag error light in a VW Passat?

The most common causes for an airbag error light in a VW Passat often include faulty wiring or connectors, especially those located under the seats (for seat occupancy sensors or side airbag connections) which can become loose or corroded. Other frequent culprits are a faulty seat belt buckle or pre-tensioner, a defective clock spring in the steering wheel (affecting the driver's airbag), a malfunctioning crash sensor, or a problem with the SRS control module itself. Occasionally, even a low car battery or a recent car accident (even minor ones that don't deploy airbags) can trigger the light.