A6 3 warning chimes whilst driving

[Mattlan]

My friends A6 y reg saloon regularly gives him three warning beeps whilst he is driving.

This can happen at any speed and any time during his journey.

His pixel dash warning system is almost non existent although he suspects having seen 4 circles with a line through them at some point in the past when this happened.

Anyone able to point him in the right direction?

Many thanks

[Mattlan]

Can't decipher the colour as the warning pixel box on dash is practically dead

[Mattlan]

thanks folks, have passed on your comments