Air pump. Porsche 986 Boxster / 996  ❭  99660510404

Air pump
This Porsche Genuine OE Secondary Air Pump is an original factory emissions-control component designed for Porsche 986 Boxster and Porsche 911 (996) models. This pump is part of the Secondary Air Injection (SAI) system, which works with the engine management and catalytic converters to reduce exhaust emissions during cold engine start-up.

Fits:
Porsche 986 Boxster / Boxster S 2000 - 2004
Porsche 996 C2 / C4 / C4S 2000 - 2005
Porsche 996 Turbo 2001 - 2005

Diagram ref no 1

This part supersedes earlier Porsche part numbers: 99660510400,  99660510401.

The secondary air pump injects fresh air into the exhaust system immediately after a cold start. The additional oxygen helps burn unburned hydrocarbons in the exhaust gases, allowing the catalytic converters to reach their operating temperature more quickly and significantly reducing harmful emissions.

The pump operates automatically under control of the engine control unit (ECU) and works together with air valves and sensors to maintain efficient emissions performance.

Functions & Technical Role
•  Secondary air injection: Pumps fresh air into the exhaust stream during cold start
•  Emission reduction: Helps oxidize unburned fuel in exhaust gases
•  Catalytic converter warm-up: Improves catalyst efficiency during engine warm-up
•  ECU-controlled operation: Integrates with engine management and emission sensors
•  OE reliability: Manufactured to Porsche specifications for correct airflow and durability

Fitment / Position on Car
•  Fitting position: Engine compartment / emissions system
•  Location: Installed within the secondary air injection system, connected to the exhaust air passages
•  System: Exhaust emissions control system

Secondary air pumps operate during every cold start and are exposed to heat, moisture, and frequent operation cycles. Over time, internal components may wear or fail, which can cause:
•  Check engine light related to the secondary air system
•  Increased cold-start emissions
•  Rough idle or unusual pump noise
•  Failure during emissions testing

Replacing a faulty pump with a genuine Porsche OE unit restores proper emissions system performance and ensures the vehicle meets factory operating standards.

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Related, superseded, cross reference or alternative numbers for comparison.

99660510404

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