I am a DIYer trying to fix the clutch actuator motor on my Smart fortwo. The actuator has 3 components

A. the motor

B.the mechanical arm

C. the encoder.

A & B are good. component C is as shown.

encoder from smart fortwo actuator motor


  1. What type of encoder is this?
  2. How does it suppose to work?
  3. Can i fix it by cleaning it? if not what is the fix?

Looking forward to your assistance. N.B I am not an Engineer - Not any! I have loads of the actuator DEAD!Tired of buying. and strongly believe there is a fix for them.


These are most likely SS461A hall effect sensors. They are about 2€ a piece. It may be worth a try to replace them. (They are available from other distributors as well.)

But first check if the magnet on the rotor isn't missing (or if the rotor has a slot instead.)

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