Randomly while driving or standing still I get a bunch of warning lights that come on, beep and blink. Sometimes it lasts a few minutes, sometimes it will stay on for a few days of driving and turning ...
I have an Audi A4 1998 with over 200k miles. It gets extremely noisy when idle. It usually doesn't happen until it has been running for a while. Revving above 2000rpm can settle it and it isn't noisy ...