Originally Posted by dedwards0323

I swapped out the LED bulbs for the license plate lights with conventional 6418 bulbs. I did a little comparison while I was doing this work. Turns out the LED bulbs were just slightly shorter than the conventional 6418 bulbs (naked eye probably wouldn't see the difference). I figure it was enough of a difference that the LED bulbs was slipping out of the plastic retainers in the light fixture with enough deck lid closures over time. That resulted in the LED bulb losing contact with the bulb holders & generating the failed exterior light warning light in the instrument panel.