I've replaced the front marker bulbs.
Take a flat smallish screw driver, and insert it behind the yellow lens.
Carefully pop it out.
Move the lens towards the rear, to unhook the 2 plastic tabs. (don't force it or you'll break them off!!)
The bulb is now exposed.
Pull it straight out, and replace it.
You might try wiggling it abit first.
It might just be a poor, corroded contact.
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To replace the side marker lamp on a Mercedes S430, first, ensure the vehicle is turned off and the keys are removed. Locate the side marker light assembly, gently pry it out using a flathead screwdriver or trim removal tool, being careful not to damage the surrounding area. Disconnect the old bulb by twisting it counterclockwise, then replace it with a new bulb. Reinsert the assembly back into its slot and ensure it is secure.
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All I did was remove the side marker lens by taking a small flat head screwdriver and pop it out. The side marker isn't screwed in so it comes right off. Then just remove the bulb by rotating counterclockwise.
The bolt pattern from the S430 is 5x112
I'm pretty sure that it is integrated into the either the front or rear windows. Therefore you would have to replace the windshield, or rear window.
What?