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I have around 130,000 miles on my 2003 A/T 4WD SE. It started around 6 months ago, I don't drive it regularly, but sometimes I turn the key and it does not start. If I turn off and then try again, it starts. I don't have Check Engine light on. I searched and it could be Ignition Switch. I'm eager to replace it, I guess it's not a big deal but only thing that worries me is if I need to reprogram key after that. Open to other suggestions as well.

When you say "turn the key, it doesn't start" do you hear the starter motor turning or no sounds at all? If the starter is turning but the engine doesn't start then it's of course not the starter. If there's no sound at all (maybe just a click from the relay) then it could be the starter. My 2003 has around 160k miles and the starter had clearly been repaired before. My symptoms were "turned key, relay clicked but starter didn't spin. Kept the key in the starting position and after about 20 or 30 seconds the starter came back to life and engine started right up". That delay was getting worse so it was only a matter of time before the car left me stranded. Replaced ignition switch, that did nothing so I replaced the starter motor and it was as good as new.