Steering rack boot O-ring. Porsche Cayenne 955 / 957 / 958

Steering rack boot O-ring.
The Genuine Porsche N90180902 O-Ring is the factory-specified sealing ring used on the steering rack boot (bellows) in Porsche Cayenne models. This factory seal ensures a tight, durable fit between the rack and boot — preserving smooth, leak-free steering operation.
Sold each, 2 required per vehicle.

Fits:
Porsche Cayenne 955 2003 - 2006
Porsche Cayenne 957 2007 - 2010
Porsche Cayenne 958 2011 - 2017

Diagram ref no 4

•  Position: Between steering rack housing and boot (bellows)
•  Function: Seals the interface to prevent fluid leaks and protect internal rack components

The O-ring can harden, flatten, or crack over time due to heat, fluid exposure, or age.

Replacement is recommended when:
•  Replacing or refitting steering rack boots
•  Servicing the steering rack or tie rod assemblies
•  Evidence of moisture, fluid seepage, or debris inside the bellows

Replacing with a Genuine Porsche N90180902 O-Ring ensures proper sealing, preventing premature wear or corrosion of internal steering components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

N90180902

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