This happens to ALL W124 at some point.

The only replacement tumbler you can get is from a dealer and your dealer knows what key you have and will get you a matching tumbler. Bring your VIN and proof of ownership.

It takes a special tool to remove the tumbler, and if you have a good relationship with your dealer or independent mechanic, they can install the new part in about 30 sec.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles