Technical Service Bulletins (TSBs) for the 1990 911 are official communications between Porsche & their dealerships that describe processes for troubleshooting or fixing certain common problems. All vehicle manufacturers are required by U.S. law to make their TSBs available to the public.

    SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS

    • TSB #GRP4/9310

      Date Announced:
      AUG 01, 1993
      NHTSA ID:
      #39626

      BRAKE VIBRATION DAMPER APPLICATION - NEW DAMPING PLATE WITH STEEL CLIP. *TW Read More »

    POWER TRAIN:MANUAL TRANSMISSION

    • TSB #GRP3/9503

      Date Announced:
      APR 01, 1995
      NHTSA ID:
      #39716

      THE FRONT TRANSMISSION CASE COVER AND SPUR GEARS ARE NO LONGER AVAILABLE AS SEPARATE PARTS. *TW Read More »

    UNKNOWN OR OTHER

    • TSB #PK-D8-16

      Date Announced:
      MAR 02, 2011
      NHTSA ID:
      #10038544

      PORSCHE: INFORMATION ON HOW TO READ THE VIN. *RM Read More »

    • TSB #0203

      Date Announced:
      AUG 16, 2002
      NHTSA ID:
      #10010766

      EXCHANGE ENGINES AND TRANSMISSIONS FOR WARRANTY. THIS BULLETIN REPLACES BULLETIN WTY0203 DATED 2-15-02. *TT Read More »