Nothing works on my 2003 hyundai sonata v6

The starter can go bad like that.

Access to the starter is from under the vehicle.... probaly on the back towards firewall and must be over exhaust (looking up from under it) and attached to transmission. REMEMBER: disconnect battery negative post cable 1st! If you want to be certain it is starter first either while it's still connected to battery, go under and check if you have constant 12v on main terminal and switch terminal should have 12v ONLY when key is "cranking"... hold key long enough to test for current. If all is as should be, continue to remove starter after disconnecting battery. Bench check both old (to be sure its bad) and new (so you don't install a defective one).

one before the cat and one after ,their are two on this model if i remember rightly

the torque spec's are 71-89 inch pounds. start with the center bolts then work out in an opposite, (criss/cross) pattern, like you would tightening wheel lugs. please rate if this helped!

i have doubt about, how to test the Igniter of Huyndai sonata2003 model. the car doesn't start and i am in a way that i want to fix the problem by myself

Not the battery. Once the car is started, a bad battery will not cause it to stop running all of a sudden.
For engine to run you need - compression, air, fuel, spark.
Might want to check out your ignition coil for an intermittent condition - try replacing it.
And if it does not turn over(crank) check the wiring going to the starter motor,solenoid, for good connectivity. And make sure that your fuel pump is always getting power and pumping.

Wiring problem or the ECU (engine control unit) is defective. Try this, disconnect the battery cables from the battery and short/touch them together for 30 seconds (do not do this if connected to the battery). Then, reconnect the cables to the battery posts & see if that fixes it. If it doesn't, then there is a wiring problem associated with the cam pos snsr or the ECU has gone bad.

autozone can tell you what is wrong but only if the light is on, they can check your alternator,battery and even your starter for no charge.

Sound like the vehicles ECU (electronic control unit) is acting up. All electronics are controled through this module as well as the features your car is programed with. Many manufacturers have different names for these modules but they all perform the same tasks. Your best bet is to bring it to a dealer where they can hook up a computer whith their diagnostic software in it to pinpoint the problem. All electronics in vehicles are controled by modules which are like mini computers.

No it is not necessary to remove whole dashboard. AUDIO UNIT 1. Disconnect negative battery terminal. 2. Remove center facia panel.