What causes the yellow check engine light to come on in an Audi A5?

I recently noticed the yellow check engine light on my Audi A5. What could be causing this and is it something I should be concerned about?

The yellow check engine light can come on for a variety of reasons. It could be something as simple as a loose gas cap or it could indicate a more serious issue with your engine. It's important to get your car checked by a mechanic as soon as possible to diagnose the issue.

One common cause for the yellow check engine light in an Audi A5 is a faulty oxygen sensor. This sensor measures the air-fuel ratio in your engine and if it's not working correctly, it can cause the light to come on. It's recommended to get this fixed as soon as possible to avoid further damage to your engine.

Another possible cause is a malfunctioning catalytic converter. This component helps reduce emissions from your car and if it's not working properly, the check engine light can come on. Take your Audi A5 to a trusted mechanic to determine if this is the issue and get it fixed to avoid failing emissions tests.