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Hello, I'm Brandon - VW tech.
They need to plug it a scanner into your vehicle to see which sensor is open.
Most of time it is the seat belt restraints system that has an open circuit or the weight sensor under the seat.
The only way to know is to plug in the scanner.
Let me know if you have further questions. Please rate me positive, thank you.
The shop you did the oil change might have a scanner that retrieve the trouble code.
Yes, it will be safe to drive.