2009 Hyundai Sonata turns over but will not start, sometimes.

any number of things can precipitate this condition...get the diagonstic OBD-II trouble codes read from your auto parts store or get a code reader (cheap) and find out fer ye self~

Thanks judge Roy, I have a code reader but being so intermittent I don't believe I will see a code does it not have to be active? Right now usually on the third attempt it starts. I will differently hook up to it and check for codes. Bill

this vehicle is in Canada? think basics....air, fuel, spark, timing---both ignition and sadly CAM timing too~ one of these basics is mis-behaving~ you are on the road to diagnosis of your problem through elimination, perhaps your code reader needs a new 9v battery (if that's what it takes)~

Came up with no signal from transponder in key, try other key. Got new key cut and programmed was good for a day.

Jeez, billy I should hope for more than one day....was there anything else?

codes p1693 &p1696

P1693 HYUNDAI - Immobilizer Transponder P1693 immobilzer mismatch~ does this help?

stop you dead in your tracks or just a nuisance?

bypassed remote seems alright so far

Took it to Hyundai and they replaced coil around ign swt on warranty, then I hooked remote back up and everything is good.

my 2009 sonata crank take 15 second to get it going but the engine light is on

my2009 sonata crank but take 15 second to get it going at the same time engine light is on