1991 Porsche 928 Service and Repair Manual
1991 Porsche 928 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.
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A PLASTIC FILLER PIECE LOCATED IN THE AUTOMATIC TRANSMISSION WAS INSTALLED WITHOUT SUFFICIENT SUPPORT. THIS FILLER PIECE CAN MOVE BECAUSE OF THE HYDRAULIC PRESSURE IN THE SYSTEM, AND NOT ALLOW THE AUT
IF THE ACCELERATOR PEDAL IS PUSHED INTO THE KICK-DOWNPOSITION, THE EXPECTED ACCELERATION OF THE VEHI
DEALERS WILL INSTALL A NEW FILLER PIECE WHICH HAS A SECURING BRACE TO PREVENT MOVEMENT.
Information for PIWIS tester update 42.300.050 & .052
Instructions on manufactures certificate for approved Porsche A40 engine oils
Instructions on manufactures certificate for approved Porsche C30 engine oils
Instructions on manufacturers certificate for approved C20 engine oils
Information for PIWIS tester update 42.300.035
Information for PIWIS tester update 42.300.040 & .041
Information for PIWIS tester update 42.300.030 - .032
Parts information for parts withdrawal involving the glass roof - 9J0877069EY and 9J0877069DY
Showing the 8 most recent of 81 technical service bulletins on file with NHTSA.
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