Why is my Audi A1 displaying the 'Check Engine' light?

I recently purchased a used Audi A1 and noticed that the 'Check Engine' light is constantly on while driving. What could be the possible reasons for this and how can I fix it?

The most common reason for the 'Check Engine' light to come on in an Audi A1 is a faulty oxygen sensor. This can affect your vehicle's fuel efficiency and emissions. I recommend taking your car to a certified mechanic to get the sensor replaced.

Another possible reason could be a loose or damaged gas cap. Try tightening your gas cap and see if the light goes off. If not, then I suggest taking your car to an Audi dealership for a diagnostic check.