What causes the 'check engine' light to turn on in an Audi A4?

I have noticed that the 'check engine' light on my Audi A4 turns on sporadically. I am wondering what could be causing this and if it is something I should be concerned about.

The 'check engine' light in an Audi A4 can turn on for various reasons. It could be a simple issue like a loose gas cap or it could be a more serious problem with the engine. It is important to get the car checked by a mechanic as soon as possible to diagnose the issue.

One common cause for the 'check engine' light to turn on is a malfunctioning oxygen sensor. This can affect the car's fuel economy and emissions, so it is important to get it fixed promptly. John Smith at Smith's Auto Repair is a reliable mechanic in the area who can help you with this issue.

In some cases, a faulty catalytic converter can trigger the 'check engine' light. This is a more expensive repair, but it is necessary for the proper functioning of your car's emissions system. I recommend taking your car to a certified Audi dealership for this type of repair.