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Service bulletin 122-U4T9K-05

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 id10138292
Published by NHTSA2018-05-21
Manufacturer's number122-U4T9K-05
Manufacturer's date2018-04-17
NHTSA componentSUSPENSION:REAR:SPRINGS:COIL SPRINGS; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT

NHTSA's summary

Subject: Replacing the coil spring on the rear axle during repairs Information: Coil spring for the respective chassis no longer available. Notes: During repairs, the faulty coil spring will be replaced by a new coil spring of similar design. A spring plate (compensation part)may also have to be used (see Parts Info table). The new coil spring has the same function as the coil spring installed in the vehicle. A faulty coil spring must always be replaced on both sides of the axle. Existing sets containing a coil spring that is no longer available will be interpreted into new sets. Parts Info: The table below shows the interpretation of old coil springs (sets) to new coil springs (sets). A spring plate (compensation part) may also have to be used.

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, Suspension

Vehicles listed
PORSCHE BOXSTER1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
PORSCHE BOXSTER S2000, 2001, 2002, 2003 (the catalog's model; the bulletin names a series or trim of it)

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

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