My check engine light stays on -when I take it to the shop it shows no code errors —mechanics guess it is a bad Sam unit but they are not sure and I do not even know which Sam unit to check. All equipment on the car seems to be working well     

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It is a signal acquisition module. SAM receives data from sensors, switches, and controllers and can send data, actuate the components and monitor systems. Mercedes-Benz has been using Sam module since mid 90s.

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