How to fix Audi A4's check engine light?

My 2015 Audi A4's check engine light has been on for a few days now. I've noticed some slight decrease in performance. What could be causing this issue and how can I fix it?

There could be a few potential causes for your check engine light to be on. It could be as simple as a loose gas cap or a more serious issue like a faulty oxygen sensor. I recommend getting your car diagnosed by a certified mechanic as soon as possible to avoid any further damage to your vehicle.

It's always a good idea to have your car's check engine light looked at as soon as possible. The longer you wait, the more potential damage could be done to your car. I suggest bringing it to an Audi dealership or an auto shop that specializes in German cars.

I had a similar issue with my Audi A4 and it turned out to be a faulty catalytic converter. It's important to get this fixed as soon as possible because it can cause your car to fail emissions tests and may even be a safety hazard.