beetle warning light

[therams]

hello, whilst driving this morning the warning light on the dash that looks like some coils came on and flashed for 5 minutes or so, then went off. can't replicate whatever was going on and its not happened since

anyone know what that flashing coil light is indicating?

its a beetle 1.9pd 2005 if that helps

thanks in advance

[therams]

i've worked it out - bizarrely it means i've got a brake light out!