Why is my Audi 80's front airbags not deploying during a crash?

I have a 2001 Audi 80 and noticed that the front airbags did not deploy when I accidentally hit a curb while driving. The car has been in an accident before and had the airbags replaced, so I know they are present. What could be the possible reasons for this failure?

This could be due to faulty crash sensors, which may have not been replaced during the airbag replacement. It is important to have these sensors checked and replaced if necessary.

Another possibility is that the airbag control module is malfunctioning. This controls the deployment of the airbags and needs to be checked and replaced if needed.