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Service bulletin 991440-15

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10198508
Published by NHTSA2021-06-28
Manufacturer's number991440-15
Manufacturer's date2016-03-02
NHTSA componentPOWER TRAIN; STEERING; EQUIPMENT

NHTSA's summary

Power Steering Plus (I-no.658 ) - Power steering plus is a speed sensifitive power sterring system. It reduces steering forces while manoeuvring the vehicle and driving at low speeds.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Steering, Transmission and driveline

Vehicles listed
PORSCHE 9112017

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
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No. 27-262026-10-02. Service bulletin. Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils. Note that the bulletin covers all models back to model year 1984, for which C20 engine oils are allocated.
No. 26-262026-10-02. Service bulletin. Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils. Note that the bulletin includes all models back to model year 1984, for which C30 engine oils are allocated.
No. 25-262026-10-02. Service bulletin. Manufacturer's Certificate for Overview of Approved Porsche A40 Engine Oils. Note that this bulletin covers all vehicles from model year 1997 to 2020, for which A40 engine oils are assigned. Model years 1997-2001 are not available for selection in the system.
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No. D7802026-05-07. Service bulletin. Parts information for parts withdrawal involving the transmission oil. Part number 00004321012 is affected - the vehicles that use this part number should be included.
No. D7762026-05-06. Service bulletin. Parts information for parts withdrawal involving the transmission oil. The vehicles affected are ones that use the part number 00004330563