To clarify, if you are referring to the Check Engine Light use and OBD2 scan tool to reset the light after the repair. But I assume you are NOT talking about the Check Engine light and are referring to the Maintenance Required light. If so, it Depends on the vehicle. On most Hondas press and hold the odometer reset button while at the same time turning the ignition to the on position without starting the engine. The light will go out in 5 seconds. On other vehicles you use the same or a different procedure. You failed to list the make, model, and year so that is all I can tell you.
The maintenance required light only goes on after 7,500 miles since last 'maintenance'. The maintence required light will not turn off by replacing or changing anything, the only way to turn it off is by putting your key in the key slot next to the light.
HOW TO TURN OFF THE MAINTENANCE LIGHT ON 2002 HONDA ACCOURD
It means that there is some sort of maintenance required - you'd need to pull codes to determine exactly what. Performing the required maintenance successfully should shut the light off.
What year ?
instructions are in the ownwers manual.
Turn igniton to on position and put odometer in trip mode, turn off ignition. Hold trip button in and hold it in as you turn ignition to on position, it will flash Turn off ignition. Maintenance light should go and stay off
Easiest way is to have the required maintenence done.
Consult the drivers manual. You will find that information in there.
Here is a link that walks you through turning off the maintenance required light step by step, I'm totally not car knowledgeable and did it on my on in two minutes! http://www.wikihow.com/Turn-off-the-%22Maint-Req%22-Light-on-a-2001-Honda-Civic
a computarized test will tell the mechanic why that light is on. You can turn off that light with the computer but if the problem is not corrected it will go back on soon after turning the engine on.
push the odometer button in, turn the key on, wait till the light goes out (could be a long time), turn the key off.
on the odometer there are 2 buttons press right and turn ignition without release this button 10 second light turn off