Strange warning lights

My 2009 79k miles had it since aug 24 so just over two years 11 thousand trouble free miles .changed all discs and calipers and obviously pads ,since i got the car its had some quirky electrical warning lights on dash ,if any light is lit in car sidelight boot light interior light etc etc etc then warning lights show up on dash a left hand green indicator light and oil low warning light if i indicate left the left indicator light on dash flashes but also the right , i am told its likely a short somewhere ,a bad bulb a bad earth etc etc its not caused me any problems but would love to find the fault .would a code reader be able to identifyespecially if it was a dealer version,?