Tool code by the odometer

If it looks like a wrench it's telling you the car needs service.

all the warning symbols are listed on a page in your owners manual. you said a "tool code",but maybe a "wrench symbol instead",could mean time for an oil change? owners manual pdf file,copy and paste if you don't have one Owners Manual https://cdn.dealereprocess.net/cdn/servicemanuals/mitsubishi/2015-mirage.pdf