Why is my Audi A3's check engine light on after filling up with gas?

I recently filled up my Audi A3 with gas and now the check engine light is on. What could be causing this and how can I fix it?

It is common for the check engine light to come on after filling up with gas in the Audi A3. This could be due to a loose gas cap or a faulty oxygen sensor. I suggest checking the gas cap first and making sure it's tight. If the light persists, you may need to get the oxygen sensor replaced by a professional mechanic.

I had the same issue with my Audi A3 and it turned out to be a faulty gas cap. I suggest getting a new one and making sure it's tightly secured when you fill up with gas.