Accelerometer
      Part Nos.
        901-03 #4 993 606 153 00 (2) side acceleration sensor
          pet shows both lateral and longitudinal with same part number
          928.606.153.00
      Removing and cleaning the accelerometers
        Post #22 - https://rennlist.com/forums/showthread.php?t=107285
        Removal
          - Remove two screws on passenger side of tunnel and remove cover.
          - Remove single bolt holding wiring bracket. Pull bracket and
            wires out and let hang
          - Remove rear most accelerometer by removing the two sheet
            metal screws. I used a 90 degree phillips screwdriver.Now
            you are getting some room to get that forward unit.
          - There is a small relay above the forward unit-- wiggle it out
          - Remove the front screw from the forward accelerometer and
            the patiently loosen the rear screw. This will take time as
            you only can execute partial turns. I labeled the
            accelerometers them to avoid confusing them .
        I removed the covers and tried to clean the surface between the pendulum
          and the magnet but did not have the room. I lremoved the two screws
          holding the unit in and then carefully lifted it up taking care not to
          bend the pins or circuit board.This gave me just enough room.
        First I removed the large filings and "magnetized debris with a fine
          angled pick and then intermittently irrigated the area with electrical
          cleaner ( from Pep Boys). Finally I got a thin piece of card board
          between the pendulum and magnet and cleaned the last bit.Before closing
          the unit I cleaned with the electric cleaner. Make sure it is dry or
          you get to take it all apart and dry it. You can tell that it works
          because the pendulum comes back to center after you move it in either
          direction.
        Prior to cleaning mine they would remain stuck in both directions and
          failed to come to center.
        Well I hope this helps Good Luck, Harpreet
        PS I cut a slot through the rear mounting hole for the front unit this
          made it easier to reassemble... I was able to partially screw in the
          back screw and then slide the accelerometer .....nothing like a dremel
          tool..
      Shop Notes
        Lateral sensor is in front; has black connector
        Axial (longitudinal) sensor is in back; has gray connector