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I had the exact same problem with my 2002 CLK430 cabriolet. Everything seemed fine 99% of the time, but when I drove over and uneven surface diagonally--- like pulling into a gas station on a slightly higher grade than the road --- I could hear a distinct THUNK from under the car. Mine sounded like it was coming from the forward part of the car.

The problem was a loose bolt that holds together a couple of pieces of metal that add structural support to the vehicle. I think they are specific to the cab, but not sure. Solution was to disconnect the pieces, clean them off really well and bolt them back together REALLY tight.

If the problem is ignored for too long, the pieces in question can degrade to the point where they must be replaced at substantial expense. This was not the case for me. I think the cost at my local German Indy specialist was less than $100 for the fix. I haven't heard a peep since.

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Q: Your 2002 clk430 cabriolet makes a thunk-grinding noise under the driver seat when you drive over a bump on the diagonal what is it?
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