The maintenence required light and engine light are both on. I know that my oxygen sensor needs replacing, but will that also take care of the maintanence required light?

 

The information on how to turn the maintenance required light off, is in the owner's manual.
Hold the trip/odometer reset button, with your left hand. Keep holding the button down, and turn the key to position II (on, not start). Continue to hold the button until the light goes out (10 seconds). Don't just turn the light off, do the maintenance that is due. If you don't have an owner's manual, you can get all the information from the Honda owner's link. Just about any auto parts store can read the codes for the check engine light.

 

I tried to get the light to go out following the steps, but it comes right back on. I already found out I need a oxygen sensor. Are they hard to replace? Can I do it myself, or should I get a mechanic to do it...

 

If you can't get the maintenance required light off, I would bring the O2 sensor to a professional.

 

If it's the lower 02 sensor under the car, then it's easy.

You're only trouble is to get under the car using a lift, don't use jacks.

You can rent the tool for free at Autozone or Advance Auto with a deposit.

And for the love of God, do remove the seat to get to the plug thing.

Also, use a flat head screwdriver to remove the black plastic tabs, from the front.