What does the red exclamation mark on Audi A4 indicate?

[DeZoe]

A red exclamation mark appearing on the Audi A4 likely indicates a brake system malfunction. In such cases, you should drive at low speed or stop to inspect the vehicle. Brake System Malfunction: The red exclamation mark is the brake system warning light. When this light illuminates, it is highly probable that there is a malfunction in the brake system. You should drive at low speed or stop to inspect the vehicle. It could also indicate that the electromechanical steering mechanism is not functioning or there is a fault in the steering column lock, in which case you should not continue driving. Tire Pressure Low Warning: If the warning is due to low tire pressure, it is recommended to check for signs of air leakage in the tires. If the tire pressure is normal, you should visit a 4S shop to inspect the tire pressure sensor.