MB uses interlock CABLES on 1990 to 98 models, so sound is from something else. Any play in shifter with engine not running & lever in D OR N? MB uses rubber grommets that wear out at both ends of shift rod & that can cause noise.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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