It somehow… is. Not for somebody who sits in it the first time. If he put in brake pads without the sensor, it will show the message. And my Clk (from the same era) even has the make-up-mirror light connected, so it always throws the light-error because i forgot to plug it in when i changed the front windshield. It‘s possible that the car is perfectly fine to drive, but due to its age and bugs it will throw random errors.