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· BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
1,150 Posts
It sends a signal to the ECU every time the little peg on the crankshaft front pulley passes it. The ECU uses the signal to determine the engine RPM and then set all the timing off it.

If it's bust the engine doesn't run.
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