Don't know if the design is the same as the 95 E320 but on mine the little piece of black plastic with the teeth on it which contacts the motor was loose or broken--fixed it with a hose clamp--free.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro