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Service bulletins for the 1990 Porsche 911

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

92 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
No. 14-232023-08-04. Service bulletin. ENGINE AND ENGINE COOLING. Manufacturers certificate for allocation of approved engine oils
PIWIS2301as2023-08-03. Service bulletin. EQUIPMENT. Information for PIWIS tester update 42.100.000, .010 & .011
PIWIS2301ar2023-08-03. Service bulletin. BACK OVER PREVENTION:SOFTWARE. Information for PIWIS tester updates 42.000.050 & .051
PIWIS2301aq2023-08-03. Service bulletin. BACK OVER PREVENTION:SOFTWARE. Information for PIWIS tester update 42.000.048
PIWIS2301ap2023-08-03. Service bulletin. EQUIPMENT. Information for PIWIS tester update 42.000.040
PIWIS2301ao2023-08-03. Service bulletin. EQUIPMENT. Information for PIWIS tester update 42.000.035
No. 23112023-07-06. Service bulletin. EQUIPMENT. Special tools information on an upgrade to the pushers for the VAS5237
No. 02-23-12023-04-06. Service bulletin. ENGINE AND ENGINE COOLING. Manufacturers certificate for approved engine C20 engine oils.
No. D4a2023-04-06. Service bulletin. EQUIPMENT. Product knowledge for the Porsche evolution from 1948-2023.
PIWIS2301k2023-03-04. Service bulletin. EQUIPMENT. Information for PIWIS tester update 41.750.045 & .046
No. 23032023-03-04. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Special tools information for the pneumatic cartridge gun.
No. 05-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine A40 oils for all Porsche models that use A40 oil.
No. 04-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C40 oils for all Porsche models that use C40 oil.
No. 03-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C30 oils for all Porsche models that use C30 oil.
No. 22342023-01-10. Service bulletin. ELECTRICAL SYSTEM. Instructions on advanced technical information for improper odometer and speedometer function
No. 17D4a2023-01-10. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. The following illustrations are based on the four poster set "Evolution Porsche 1948-2006".
No. 1758.42022-12-07. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Special tools information for the logo templates and exchangeable inserts.
PIWIS2202b2022-12-07. Service bulletin. EQUIPMENT. Information for PIWIS tester update 41.500.020 & .022
No. 22212022-12-07. Service bulletin. EQUIPMENT. Special tools information for the 9282 supersedes to the PNA9282NAR.
PIWIS2201au2022-10-05. Service bulletin. EQUIPMENT. Information for PIWIS tester update 41.400.000 & .010.
PIWIS2201at2022-10-05. Service bulletin. EQUIPMENT. Information for PIWIS tester update #41.375.050
PIWIS2201as2022-10-05. Service bulletin. EQUIPMENT. Information for PIWIS tester update #41.375.045.
No. D6152022-10-05. Service bulletin. EQUIPMENT; FUEL SYSTEM, GASOLINE. Parts information for parts withdrawal involving the fuel filler flap
PIWIS2201ar2022-10-05. Service bulletin. EQUIPMENT. Information for PIWIS tester update #41.375.040
No. 1804.12022-09-08. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. Instructions on advanced technical information for the lubricant for the sunroof/sliding roof.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.