Reset wrench light on mercedes ml500 - 2004 Mercedes-Benz Mercedes Benz M Class

SOURCE: ml500 mercedes service and engine lights on dash

If you are having a Check Engine Light, then there is something wrong and you need to have it checked.

As for the service indicator, then follow the instructions int eh car owner manual for resetting.

SOURCE: How do you reset 2006 ml500 mercedes benz

You will need a code reader/scanner called OBD2. They are under $50. A nice one can cost $100-$3,000. Just buy one that does the job...no need for the more expensive ones. You can borrow one from some auto parts stores, like the AutoZone.
You can also pay a shop this much to do it for you, every time.
Just select erase codes, and you're done.

SOURCE: when i start my 2002 ml500 a display light of a

your car is over due service you will need to have service light reset its just a indcator to let you no your car is due a service.