Have the car re-scanned. P0310 is cylinder #10 misfire. This code is no applicable to the Accent.
Trouble code P0172 means: System too rich (Bank 1)
The code 1709 is pointing to a problem with the Kick Down Servo Switch. Circuit open or shorted to ground.
P0440 = EVAP Emission Control System Malfunction.
Got Less Stuff
GLS means General Luxury Sedan (not that it necessarily is, but that is what it stands for)! Stuart
gas cap faulty
Trouble code P0750 means:Shift solenoid A malfunction
There appears to be a problem with 2001 Hyundai Accent electrical system. IE: When I turn on my ignition, the radio comes on. Have checked.
Generic code P1457. EVAP Control system leakage.
0320 code
Trouble code P0740 means:Torque converter clutch circuit malfunction
if u mean for the timming belt i would sugjest taking it to an expirienced mecanic if you do it wrong it will total your car