How do I turn the maintenance light off in my 07 Hyundai Sante Fe

If you don't see anything on the radio saying "auxiliary output" with a little earphone jack then you aren't Aux ready.

You might be able to go to a stereo shop and have them install an auxiliary output plug. They will pull the factory stereo out and splice/plug in an output wire that you can plug your iPod into.

fuel injectors

Click here to see key fobs.

Has the battery been tested, are the battery cables clean and free of corrosion?

Go to a place where they just do air condition work and they will know.

Toe will chew up your tires much quicker than camber will

Whenever the 'CHECK ENGINE' (Service Engine Soon) light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.

Either a brake pad or the fan belts !
Lube the fan belts with candel wax or silicone spray, if the same noise, it is a brake pad !!