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.

    BRAKES (PWS)

    • TSB #No. 1801.4

      Date Announced:
      MAR 30, 2022
      NHTSA ID:
      #10209901

      Advanced technical information for a brake squeal. Read More »

    • TSB #ATIALL41605

      Date Announced:
      MAR 24, 2016
      NHTSA ID:
      #10198525

      Understanding and addressing brake squeal complaints. Read More »

    SERVICE BRAKES, HYDRAULIC

    • TSB #122-L5E2R-04

      Date Announced:
      MAR 01, 2018
      NHTSA ID:
      #10134862

      Subject: Replacing brake booster during repairs Information: If the brake booster on the 911 Carrera 2/Targa/Speedster (964) needs to be replaced, the replacment brake booster will be a 911 (993) version. Read More »

    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 »

    ENGINE AND ENGINE COOLING

    • TSB #No. D599

      Date Announced:
      MAR 14, 2022
      NHTSA ID:
      #10209855

      Parts information for parts withdrawal involving the valve spring. Part numbers affected are PAB109623 and 958109623. Read More »

    • TSB #No. 61-21

      Date Announced:
      AUG 31, 2021
      NHTSA ID:
      #10200773

      List of approved engine oils for all Porsche models using C40 oil. Read More »

    • TSB #No. 13-21

      Date Announced:
      MAR 26, 2021
      NHTSA ID:
      #10189886

      List of approved C20 style engine oils for classic and new Porsche models since 1984. Read More »

    • TSB #No. 09-21

      Date Announced:
      MAR 05, 2021
      NHTSA ID:
      #10189704

      List of approved A40 style engine oils for new and classic Porsche vehicles MY 1984 and newer. Read More »

    • TSB #No. 03-21

      Date Announced:
      MAR 05, 2021
      NHTSA ID:
      #10189698

      List of approved C20 engine oils for all new and classic Porsche models 1984 and newer. Read More »

    • TSB #No. 08-21

      Date Announced:
      MAR 05, 2021
      NHTSA ID:
      #10189703

      List of approved C40 engine oils for new and classic Porsche vehicles MY 1984 and newer. Read More »

    • TSB #No. 07-21-1

      Date Announced:
      MAR 05, 2021
      NHTSA ID:
      #10189702

      List of approved C30 engine oils for all new and Classic Porsche vehicles MY1984 and newer. Read More »

    • TSB #No. 53-20

      Date Announced:
      DEC 03, 2020
      NHTSA ID:
      #10185091

      List of approved C40 style engine oils for new and classic Porsche vehicles. Read More »

    • TSB #No. 54-20

      Date Announced:
      DEC 03, 2020
      NHTSA ID:
      #10185093

      List of approved A40 style engine oils for new and classic Porsche models. Read More »

    • TSB #No. 2000

      Date Announced:
      OCT 28, 2020
      NHTSA ID:
      #10182276

      Advanced Technical information on a NVH Lubrication kit. Read More »

    • TSB #122-Z2X7A-02

      Date Announced:
      JAN 30, 2020
      NHTSA ID:
      #10170997

      List of approved C20 engine oils for all Porsche vehicles since 1984. 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 »

    ELECTRICAL SYSTEM

    • TSB #No. 52-21

      Date Announced:
      APR 19, 2021
      NHTSA ID:
      #10191742

      Information on how to deal with a potential cyber security breach. Read More »

    • TSB #No. D4a

      Date Announced:
      JUN 03, 2020
      NHTSA ID:
      #10176897

      Document showing the evolution of Porsche Vehicles since 1948. Read More »

    • TSB #122-Z3C2E-10

      Date Announced:
      SEP 18, 2019
      NHTSA ID:
      #10165939

      Announcement of new Tech Live look, which will put technicians into live chats with technical support if they should have an urgent issue Read More »

    • TSB #122-L8R6J-10

      Date Announced:
      SEP 06, 2019
      NHTSA ID:
      #10165938

      Bulletin highlighting new updates 38.750, 38.750.000 for the Porsche PIWIS Tester 3 Read More »

    • TSB #122-Z6Y7L-09

      Date Announced:
      AUG 15, 2019
      NHTSA ID:
      #10165167

      Bulletin outlining PIWIS Tester updates 38.600.030 & 035. Read More »

    • TSB #122-E4R8U-09

      Date Announced:
      AUG 07, 2019
      NHTSA ID:
      #10165166

      Bulletin outlining PIWIS Tester updates 38.600.020. Read More »

    • TSB #122-B3Y6H-09

      Date Announced:
      AUG 05, 2019
      NHTSA ID:
      #10165165

      Bulletin outlining PIWIS Tester updates 38.600.000, .010, & .015. Read More »

    ELECTRICAL SYSTEM:SOFTWARE

    • TSB #PIWIS2001v

      Date Announced:
      JUN 25, 2020
      NHTSA ID:
      #10176881

      Information on new PIWIS tester update 39.500.020 and .025. Read More »

    AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE

    • TSB #122-E7M2M-09

      Date Announced:
      AUG 02, 2017
      NHTSA ID:
      #10117498

      Information: Old airbag sensor no longer available. Note: During repairs, the faulty airbag sensor will be replaced by a new electronic airbag sensor. Read More »

    EQUIPMENT

    • TSB #No. 2116

      Date Announced:
      OCT 26, 2021
      NHTSA ID:
      #10203103

      Special tools information for a new contact surface cleaning set. Read More »

    • TSB #No. 61-21

      Date Announced:
      AUG 31, 2021
      NHTSA ID:
      #10200773

      List of approved engine oils for all Porsche models using C40 oil. Read More »

    • TSB #No. D13.2

      Date Announced:
      JUN 02, 2021
      NHTSA ID:
      #10198802

      Information on new PIWIS Tester program for independent repair facilities. Read More »

    • TSB #No. 13-21

      Date Announced:
      MAR 26, 2021
      NHTSA ID:
      #10189886

      List of approved C20 style engine oils for classic and new Porsche models since 1984. Read More »

    • TSB #PIWIS2102j

      Date Announced:
      MAR 05, 2021
      NHTSA ID:
      #10189696

      Information on PIWIS Tester update 40.000.020 & .022. Read More »

    • TSB #No. 54-20

      Date Announced:
      DEC 03, 2020
      NHTSA ID:
      #10185093

      List of approved A40 style engine oils for new and classic Porsche models. Read More »

    • TSB #PIWIS2001v

      Date Announced:
      JUN 25, 2020
      NHTSA ID:
      #10176881

      Information on new PIWIS tester update 39.500.020 and .025. Read More »

    • TSB #No. D4a

      Date Announced:
      JUN 03, 2020
      NHTSA ID:
      #10176897

      Document showing the evolution of Porsche Vehicles since 1948. Read More »

    • TSB #122-J4L4X-03

      Date Announced:
      FEB 27, 2020
      NHTSA ID:
      #10172096

      Bulletin outlining new blitz table replacement castors due to a high rate of failure reported by dealers. Read More »

    • TSB #ATIALL41605

      Date Announced:
      MAR 24, 2016
      NHTSA ID:
      #10198525

      Understanding and addressing brake squeal complaints. Read More »

    EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

    • TSB #No. D4a

      Date Announced:
      MAR 30, 2021
      NHTSA ID:
      #10189921

      Historical information on Porsche product evolution. Read More »

    • TSB #Charging lockup

      Date Announced:
      JUN 19, 2020
      NHTSA ID:
      #10176905

      Info on a new customer tool for looking up campaigns and recalls on their vehicle. Read More »

    EQUIPMENT:APPLIANCE:AIR CONDITIONER

    • TSB #122-V3B6B-07

      Date Announced:
      JUN 19, 2019
      NHTSA ID:
      #10162219

      Announcement of a 6 month warranty extension on VAS 581005P R1234yf Service Units for air conditioning. Read More »

    • TSB #122-W9D2T-07

      Date Announced:
      JUN 10, 2019
      NHTSA ID:
      #10162214

      Instructions for using VAS 581005P in order to chech and service R1234yf Air Conditioning Unit. 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 »