1985 Porsche 928 AutomaticFACTORY OEM SERVICE PROCEDURE

LH Control Unit

The LH control unit is located in the passenger footwell next to the ignition control unit. All electronic switching and regulating operations are sent to the vehicle via a 25-pin plug. The multiple pin plug has a coding tab to prevent incorrect connection.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.