Technical Service Bulletins (TSBs) for the 1991 944 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: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. 14-23

  Date Announced:

  JUL 31, 2023

  NHTSA ID:

  #10240439

  Manufacturers certificate for allocation of approved engine oils Read More »

• TSB #No. 02-23-1

  Date Announced:

  MAR 24, 2023

  NHTSA ID:

  #10233941

  Manufacturers certificate for approved engine C20 engine oils. Read More »

• TSB #No. 04-23

  Date Announced:

  FEB 13, 2023

  NHTSA ID:

  #10232392

  Overview of approved engine C40 oils for all Porsche models that use C40 oil. Read More »

• TSB #No. 03-23

  Date Announced:

  FEB 13, 2023

  NHTSA ID:

  #10232391

  Overview of approved engine C30 oils for all Porsche models that use C30 oil. Read More »

• TSB #No. 05-23

  Date Announced:

  FEB 13, 2023

  NHTSA ID:

  #10232393

  Overview of approved engine A40 oils for all Porsche models that use A40 oil. Read More »

• TSB #No. 35-22

  Date Announced:

  JUL 30, 2022

  NHTSA ID:

  #10217270

  Overview of approved engine C30 oils for Porsche models using C30 oils. Read More »

• TSB #No. 36-22

  Date Announced:

  JUL 30, 2022

  NHTSA ID:

  #10217271

  Instructions on the manufacturers certificate for approve Porsche A40 engine oils. Read More »

• TSB #No. 31-22

  Date Announced:

  JUL 30, 2022

  NHTSA ID:

  #10217275

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

• TSB #No. 33-22

  Date Announced:

  JUL 30, 2022

  NHTSA ID:

  #10217276

  Overview of approved engine C20 engine oils for all Porsche models using this oil. 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. 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. 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. 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. 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. 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 »

ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION

• TSB #No. 16-23

  Date Announced:

  SEP 05, 2023

  NHTSA ID:

  #10243585

  Manufacturers certificate for an overview of approved Porsche C20 engine oils. Read More »

• TSB #No. 17-23

  Date Announced:

  SEP 05, 2023

  NHTSA ID:

  #10243586

  Manufacturers certificate for an overview of approved Porsche C30 engine oils. Read More »

• TSB #No. 18-23

  Date Announced:

  SEP 05, 2023

  NHTSA ID:

  #10243587

  Manufacturers certificate for an overview of approved Porsche C40 engine oils. Read More »

• TSB #No. 19-23

  Date Announced:

  SEP 05, 2023

  NHTSA ID:

  #10243588

  Manufacturers certificate for an overview of approved Porsche A40 engine oils. Read More »

FUEL SYSTEM, GASOLINE

• TSB #No. D615

  Date Announced:

  SEP 19, 2022

  NHTSA ID:

  #10222527

  Parts information for parts withdrawal involving the fuel filler flap Read More »

ELECTRICAL SYSTEM

• TSB #No. 2314

  Date Announced:

  SEP 06, 2023

  NHTSA ID:

  #10243597

  Special tools and equipment information for all Porsche models. Diagnostic equipment standards. Read More »

• TSB #No. 2313

  Date Announced:

  SEP 01, 2023

  NHTSA ID:

  #10243573

  Special tools and equipment information for the Pico Oscilloscope Extended Functionality Read More »

• TSB #No. 2234

  Date Announced:

  DEC 08, 2022

  NHTSA ID:

  #10229617

  Instructions on advanced technical information for improper odometer and speedometer function Read More »

• 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 »

WHEELS

• TSB #No. 28-21

  Date Announced:

  JUN 16, 2021

  NHTSA ID:

  #10198946

  List of approved wheel and tires for the 944. Read More »

BACK OVER PREVENTION:SOFTWARE

• TSB #PIWIS2301ar

  Date Announced:

  JUL 14, 2023

  NHTSA ID:

  #10240397

  Information for PIWIS tester updates 42.000.050 & .051 Read More »

• TSB #PIWIS2301aq

  Date Announced:

  JUL 12, 2023

  NHTSA ID:

  #10240389

  Information for PIWIS tester update 42.000.048 Read More »

EQUIPMENT

• TSB #PIWIS2302s

  Date Announced:

  NOV 17, 2023

  NHTSA ID:

  #10246417

  Information for PIWIS tester update 42.300.050 & .052 Read More »

• TSB #PIWIS2302r

  Date Announced:

  NOV 10, 2023

  NHTSA ID:

  #10246374

  Information for PIWIS tester update 42.300.040 & .041 Read More »

• TSB #PIWIS2302q

  Date Announced:

  NOV 07, 2023

  NHTSA ID:

  #10246372

  Information for PIWIS tester update 42.300.035 Read More »

• TSB #PIWIS2302p

  Date Announced:

  NOV 03, 2023

  NHTSA ID:

  #10246369

  Information for PIWIS tester update 42.300.030 - .032 Read More »

• TSB #No. D654

  Date Announced:

  NOV 02, 2023

  NHTSA ID:

  #10246366

  Parts information for parts withdrawal involving the glass roof - 9J0877069EY and 9J0877069DY Read More »

• TSB #No. D5

  Date Announced:

  AUG 29, 2023

  NHTSA ID:

  #10242140

  Parts information for parts withdrawal on the locks made to original key code Read More »

• TSB #PIWIS2301as

  Date Announced:

  JUL 25, 2023

  NHTSA ID:

  #10240414

  Information for PIWIS tester update 42.100.000, .010 & .011 Read More »

• TSB #PIWIS2301ap

  Date Announced:

  JUL 07, 2023

  NHTSA ID:

  #10240374

  Information for PIWIS tester update 42.000.040 Read More »

• TSB #PIWIS2301ao

  Date Announced:

  JUL 04, 2023

  NHTSA ID:

  #10240352

  Information for PIWIS tester update 42.000.035 Read More »

• TSB #No. 2311

  Date Announced:

  JUN 22, 2023

  NHTSA ID:

  #10238776

  Special tools information on an upgrade to the pushers for the VAS5237 Read More »

• TSB #No. D4a

  Date Announced:

  MAR 16, 2023

  NHTSA ID:

  #10233920

  Product knowledge for the Porsche evolution from 1948-2023. Read More »

• TSB #PIWIS2301k

  Date Announced:

  FEB 27, 2023

  NHTSA ID:

  #10232442

  Information for PIWIS tester update 41.750.045 & .046 Read More »

• TSB #PIWIS2202b

  Date Announced:

  NOV 18, 2022

  NHTSA ID:

  #10227379

  Information for PIWIS tester update 41.500.020 & .022 Read More »

• TSB #PIWIS2201au

  Date Announced:

  SEP 30, 2022

  NHTSA ID:

  #10222550

  Information for PIWIS tester update 41.400.000 & .010. Read More »

• TSB #PIWIS2201at

  Date Announced:

  SEP 26, 2022

  NHTSA ID:

  #10222545

  Information for PIWIS tester update #41.375.050 Read More »

• TSB #PIWIS2201as

  Date Announced:

  SEP 22, 2022

  NHTSA ID:

  #10222533

  Information for PIWIS tester update #41.375.045. Read More »

• TSB #No. D615

  Date Announced:

  SEP 19, 2022

  NHTSA ID:

  #10222527

  Parts information for parts withdrawal involving the fuel filler flap Read More »

• TSB #PIWIS2201ar

  Date Announced:

  SEP 16, 2022

  NHTSA ID:

  #10222515

  Information for PIWIS tester update #41.375.040 Read More »

• TSB #PIWIS2201an

  Date Announced:

  AUG 26, 2022

  NHTSA ID:

  #10219459

  Information for PIWIS tester update #41.300.000, .010 & .012 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-S9X3K-07

  Date Announced:

  JUN 05, 2019

  NHTSA ID:

  #10162213

  Describes the loaner program for the N4P000 EMCO Hardness Tester, which can be rented out by dealers and used to test the temper of the spring plate. Read More »

• TSB #ATIALL41605

  Date Announced:

  MAR 24, 2016

  NHTSA ID:

  #10198525

  Understanding and addressing brake squeal complaints. Read More »

EQUIPMENT:ELECTRICAL:ANTI-THEFT DEVICES

• TSB #No. D5

  Date Announced:

  AUG 29, 2023

  NHTSA ID:

  #10242140

  Parts information for parts withdrawal on the locks made to original key code Read More »

EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

• TSB #No. 32-23

  Date Announced:

  NOV 14, 2023

  NHTSA ID:

  #10246384

  Instructions on manufacturers certificate for approved C20 engine oils Read More »

• TSB #No. 35-23

  Date Announced:

  NOV 14, 2023

  NHTSA ID:

  #10246387

  Instructions on manufactures certificate for approved Porsche A40 engine oils Read More »

• TSB #No. 33-23

  Date Announced:

  NOV 14, 2023

  NHTSA ID:

  #10246385

  Instructions on manufactures certificate for approved Porsche C30 engine oils Read More »

• TSB #PIWIS2302h

  Date Announced:

  OCT 05, 2023

  NHTSA ID:

  #10244982

  Special tools and equipment information on PIWIS tester update 42.250.050 Read More »

• TSB #PIWIS2302g

  Date Announced:

  SEP 29, 2023

  NHTSA ID:

  #10243631

  Information on PIWIS tester update 42.250.045 Read More »

• TSB #PIWIS2302f

  Date Announced:

  SEP 25, 2023

  NHTSA ID:

  #10243630

  Information on PIWIS tester update 42.250.042 Read More »

• TSB #PIWIS2302e

  Date Announced:

  SEP 22, 2023

  NHTSA ID:

  #10243625

  Information PIWIS tester update 42.250.040 Read More »

• TSB #PIWIS2302d

  Date Announced:

  SEP 19, 2023

  NHTSA ID:

  #10243617

  Information on PIWIS tester update 42.250.032 Read More »

• TSB #PIWIS2302C

  Date Announced:

  SEP 14, 2023

  NHTSA ID:

  #10243616

  Information on PIWIS tester update 42.250.030 Read More »

• TSB #PIWIS2302b

  Date Announced:

  SEP 12, 2023

  NHTSA ID:

  #10243615

  Information on PIWIS tester update 42.200.025 Read More »

• TSB #PIWIS2302a

  Date Announced:

  SEP 08, 2023

  NHTSA ID:

  #10243598

  Information on PIWIS tester update 42.200.020 & .022 Read More »

• TSB #PIWIS2301az

  Date Announced:

  SEP 05, 2023

  NHTSA ID:

  #10243576

  Information on PIWIS tester update 42.200.000 a?? 42.200.012 Read More »

• TSB #No. 17D4a

  Date Announced:

  DEC 06, 2022

  NHTSA ID:

  #10229611

  The following illustrations are based on the four poster set "Evolution Porsche 1948-2006". Read More »

• 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 ADAPTIVE/MOBILITY

• TSB #No. 2303

  Date Announced:

  FEB 14, 2023

  NHTSA ID:

  #10232416

  Special tools information for the pneumatic cartridge gun. Read More »

• TSB #No. 1758.4

  Date Announced:

  NOV 30, 2022

  NHTSA ID:

  #10227393

  Special tools information for the logo templates and exchangeable inserts. Read More »

• TSB #No. 1804.1

  Date Announced:

  AUG 30, 2022

  NHTSA ID:

  #10219463

  Instructions on advanced technical information for the lubricant for the sunroof/sliding roof. 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 »