Some folks have had success with a little WD-40 on the ignition key & insert it a number of times to work the WD-40 in.
Others have used a spritz of WD-40, or something like CRC QD electronic spray cleaner right into the tumblers, then work the key in & out.
Others have removed the top steering post trim & gone after dirt, or corrosion that way.
Anyway your right, the problem is likely dirt or corrosion in the ignition lock cylinder, or it's attached key activated switch.
Let us know how it goes.
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Look into the slot that the keys gos into with a light. There may be a very small piece of sheet metal that will some time come off the inside of the tumbler. It will make this happen. Take a small wire and make a hook to pick it out of the tumbler. I used a small 1/16" welding wire. Hope this helps let us know.
Underneath the tumbler will be a hole where you place an awl (or similar) to push the detent in and then you pull the whole tumbler out. You may have to remove the steering column trim piece to get to the detent hole.
Once removed you can rotate the key and remove it. Put it in and out and you will see the piece of metal that pops up when the key is insert. This piece of metal grounds to the inside where the tumbler goes and activates the buzzer.
This piece could be dirty. Clean with electrical contact cleaner and lubricate with some dialectic grease.
Or you could just spray the whole thing down with WD-40, let it drip dry, wipe off and reinsert. Make sure you turn it back to RUN prior to reinstalling it. And wipe down the inside where the tumbler goes before you put it back in.
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