i have a light on my dash that has a wrench and oilcan in yellow what is this?

you are do for service

This is a signal that the oil needs changing. If that has been done, then the computer may not have been reset, after it was changed. If that is the case, then turn the switch on, do not crank engine. push the fuel pedal three times, quickly and it should flash, letting you know it has reset. Turn switch off and then crank it, it should be off after it goes through it's check. If not, you may not have reset it. If after 2nd time does not work, then you need to take to a mechanic.