CURRENT: 2011 SL550 FORMER: C300, ML350, CLK550 Cabriolet, C240, ML320, 300TD
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Are you getting any error codes, or just a noise? Changing the adjusters is a major job on that engine. I doubt it's the chain adjuster (i.e. tensioner) as it is fixed, and if it broke, it would rattle continuously. The magnets (i.e. solenoids) won't cause any noise - they are just stationary magnets. It's the adjusters that actually move and do the work. If you have no errors, I would suspect something else - adjuster problems should throw errors.