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Whether you appreciate nag lamps or not, if you perform your own vehicle maintenance at some point you’ll want to learn how to reset them.   For my 2002 Honda Odyssey I learned that this is the technique (and it’s tested as working):

Insert the key and rotate it to position II (which is the ‘electrical on’ position that turns on all the lamps inside without trying to start the car) .  Next press and hold the odometer’s Set/Reset button.  Continue holding it while resetting the key to position I, then back to position II.  Continue holding in the Set/Reset button while the key is in position II for approximately 5 seconds, and you’ll see the lamp go out.  You may then remove the key as normal; you’re done.

Please note of course that the Maintenance Needed lamp is a non-sensor based lamp that merely watches accrued mileage to remind you of proactive mileage-based maintenance such as oil changes.  It is NOT the same as a Check Engine light, which is driven by actual sensors monitoring your vehicle.  Check Engine lights are reactive and indicate real, current problems not scheduled maintenance activities.