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Porsche // Boxster 986/987/981 (1997-2016) // Any
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Air Injection Pump / Air Injectors
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
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
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
This OE Match secondary air injection pump (SIR pump) is an emissions control component designed for Porsche 986 Boxster and Porsche 911 (996) models. It forms part of the secondary air injection system, which pumps fresh air into the exhaust system during cold engine start-up to help reduce emissions.
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 injection pump, often referred to as a SIR pump or air injection pump, is a key component in the engine emissions system. It operates primarily during cold starts, forcing fresh air into the exhaust manifold. This additional oxygen helps burn remaining fuel vapours in the exhaust gases before they pass through the catalytic converters.
The OE Match secondary air injection pump follows the original Porsche design specifications for airflow capacity, electrical connections and mounting points. This ensures the pump works correctly with the vehicle’s engine control unit (ECU) and secondary air valves.
When the engine is started cold, the pump injects fresh air into the exhaust system. The extra oxygen promotes more complete combustion of residual hydrocarbons in the exhaust stream and allows the catalytic converters to heat up faster.
This process significantly reduces cold-start emissions and helps the vehicle meet environmental regulations.
Function
• Secondary Air Injection: Pumps fresh air into the exhaust system during cold start
• Emission Reduction: Helps burn unburned hydrocarbons in exhaust gases
• Catalytic Converter Warm-Up: Accelerates catalyst operating temperature
• Engine Management Integration: Works with ECU and secondary air valves
Secondary air pumps operate during every cold start and are exposed to moisture, temperature changes and exhaust gases. Over time the internal motor or pump mechanism may fail, which can trigger a check engine light and increase emissions output. Replacing a faulty pump restores proper operation of the emissions system and ensures efficient engine performance.
When to Replace. Consider replacing the secondary air pump if you notice:
• Check engine light related to secondary air injection faults
• Unusual whining or whistling noise during cold start
• Rough idle during cold start
• Vehicle fails emissions testing
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660510404
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928GTS 5.4L 1992-95
Bonded Rubber Bush M6 20x20 –
Multi-Application Mounting Bush
Sold each
High-quality bonded rubber bush M6 20x20 designed for a wide range of Porsche models including 986 Boxster, 996, 964, 968, and 928.
This versatile mounting bush is used in multiple engine bay
and chassis applications, including air pump mounting (986 Boxster and 996),
gearbox oil cooler mounting (928), and fuel filter mounting (964 and
968).
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 Speedster 1993
- Porsche 964 (911) C4 Speedster 1993
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 GTS 5.4L 1992-95
Diagram ref no 3
Manufactured to OEM specifications, this bonded rubber mount provides excellent vibration isolation while ensuring secure positioning of critical components.
Key Features
• Bonded rubber bush M6 20x20
• Suitable for Porsche 986, 996, 964, 968, and 928
• Multi-application mounting solution
• Used for air pump, gearbox cooler, and fuel filter
• Reduces vibration and movement
• Durable rubber-metal bonded construction
• OEM-style fit and performance
Function and Purpose
This bush is designed to support and isolate mounted components.
It helps to:
• Secure components in position
• Absorb engine and drivetrain vibration
• Protect sensitive parts from stress and fatigue
• Maintain correct alignment
• Improve overall system reliability
Why Replace Rubber Mounting Bushes
Rubber components degrade over time due to heat and exposure.
Common issues include:
• Cracked or perished rubber
• Excessive movement or looseness
• Increased vibration transfer
• Potential damage to mounted components
Replacing worn bushes restores stability and prolongs
component life.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970346500
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928GTS 5.4L 1992-95
Bonded Rubber Bush M6 20x20 –
Multi-Application Mounting Bush
Sold each
High-quality bonded rubber bush M6 20x20 designed for a wide range of Porsche models including 986 Boxster, 996, 964, 968, and 928.
This versatile mounting bush is used in multiple engine bay
and chassis applications, including air pump mounting (986 Boxster and 996),
gearbox oil cooler mounting (928), and fuel filter mounting (964 and
968).
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 Speedster 1993
- Porsche 964 (911) C4 Speedster 1993
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 GTS 5.4L 1992-95
Diagram ref no 3
Manufactured to OEM specifications, this bonded rubber mount provides excellent vibration isolation while ensuring secure positioning of critical components.
Key Features
• Bonded rubber bush M6 20x20
• Suitable for Porsche 986, 996, 964, 968, and 928
• Multi-application mounting solution
• Used for air pump, gearbox cooler, and fuel filter
• Reduces vibration and movement
• Durable rubber-metal bonded construction
• OEM-style fit and performance
Function and Purpose
This bush is designed to support and isolate mounted components.
It helps to:
• Secure components in position
• Absorb engine and drivetrain vibration
• Protect sensitive parts from stress and fatigue
• Maintain correct alignment
• Improve overall system reliability
Why Replace Rubber Mounting Bushes
Rubber components degrade over time due to heat and exposure.
Common issues include:
• Cracked or perished rubber
• Excessive movement or looseness
• Increased vibration transfer
• Potential damage to mounted components
Replacing worn bushes restores stability and prolongs
component life.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970346500
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 987.1 Boxster / Boxster S MKI 2005>>2008
Porsche 987.1 Cayman / Cayman S MKI 2006>>2008
Porsche 997.1 Carrera 2 / 4 MKI 2005>>2008
Porsche 997.1 Carrera 2S / 4S MKI 2005>>2008
Diagram Ref No 15
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99711334000
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Sold each
Fits:
Porsche 987.1 Boxster / Boxster S 2.7ltr / 3.4ltr - 2005 to 2008
Porsche 987.1 Cayman / Cayman S 2.7ltr / 3.4ltr - 2005 to 2008
Porsche 997.1 Carrera 2S / Carrera 4S 3.8ltr - 2005 to 2008
Porsche 997 GT3 - 2007 to 2012
Porsche 955 Cayenne S / turbo - 2003 to 2006
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95511332500
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
Fits:
Porsche 987 Boxster 2.9L 2009 - 2012
Porsche 987C Cayman 2.9L 2009 - 2012
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A160510400
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
Fits:
Porsche 987 Boxster 2.9L 2009 - 2012
Porsche 987C Cayman 2.9L 2009 - 2012
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A160510400
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
The Genuine Porsche Secondary Air Injection Valve (Part Number: 94811320351) is an original equipment emissions control component designed for selected Porsche Cayenne, 911 Carrera, Boxster, Cayman and Panamera models equipped with a secondary air injection system.
Sold Each.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
Diagram Ref No 5
Manufactured to Porsche's original equipment specifications, this valve forms part of the engine's secondary air injection system, which helps reduce harmful exhaust emissions during the initial warm-up period following a cold start.
The secondary air injection system supplies fresh air into the exhaust passages when the engine is cold. This additional oxygen helps promote the oxidation of unburnt hydrocarbons and carbon monoxide in the exhaust gases, supporting faster catalytic converter warm-up and improved emissions performance.
The valve controls the passage of this secondary air into the exhaust system and helps prevent hot exhaust gases from flowing backwards towards the secondary air pump and associated pipework.
During normal operation, the valve works alongside the secondary air pump, air hoses, control components and engine management system to deliver fresh air when required.
Over time, the original valve may deteriorate due to repeated exposure to heat, moisture, exhaust deposits and carbon contamination. Internal sticking, damaged sealing surfaces or corrosion can prevent the valve from opening or closing correctly.
A faulty valve may reduce secondary air flow, cause excessive exhaust emissions during cold starts or trigger an engine management warning light.
Replacing a worn or defective secondary air injection valve with a Genuine Porsche component helps restore the intended operation of the emissions control system, maintain proper exhaust gas isolation and protect associated secondary air injection components.
Ideal for emissions system repairs, secondary air injection fault diagnosis and Porsche engine maintenance, this Genuine Porsche replacement provides the correct original equipment specification for compatible vehicles.
What This Product Does:
The secondary air injection valve is a component of the engine's exhaust emissions control system.
Its primary function is to allow fresh air supplied by the secondary air pump to enter the exhaust system during the appropriate operating conditions.
When a petrol engine is first started from cold, the catalytic converters have not yet reached their most effective operating temperature. During this period, exhaust emissions can be higher than when the engine is fully warmed up.
The secondary air injection system introduces fresh air into the exhaust passages to help oxidise remaining hydrocarbons and carbon monoxide, supporting emissions reduction during the warm-up phase.
The valve also acts as a barrier against reverse exhaust gas flow, helping protect the secondary air pump and connected hoses.
Its main functions include:
- Controlling secondary air flow: Provides the intended air passage between the secondary air pump and exhaust system.
- Reducing cold-start emissions: Supports the oxidation of unburnt hydrocarbons and carbon monoxide during engine warm-up.
- Supporting catalytic converter warm-up: Helps establish the exhaust conditions needed for effective catalytic converter operation.
- Preventing exhaust gas backflow: Helps stop hot exhaust gases from travelling towards the secondary air pump.
- Protecting secondary air components: Reduces exposure of the pump and connected hoses to exhaust heat and contamination.
- Maintaining emissions system functionality: Supports the secondary air injection system's intended operating sequence.
- Supporting engine management monitoring: Helps maintain the airflow conditions expected during secondary air injection diagnostic checks.
- Preserving factory emissions control: Maintains the system specified by Porsche for the applicable engine.
The secondary air injection valve is not an exhaust gas recirculation (EGR) valve, an engine intake valve or a turbocharger control valve. Its purpose is to manage fresh-air delivery into the exhaust emissions system.
Symptoms Of Wear Or Failure:
The secondary air injection valve is exposed to substantial temperature changes, moisture and exhaust-related contamination.
Repeated cold-start operation and ageing may eventually affect its internal mechanism or sealing surfaces.
Common symptoms of a worn or faulty secondary air injection valve include:
- Check engine warning light: A malfunctioning valve may cause the engine management system to register a secondary air injection fault.
- Secondary air injection fault codes: Diagnostic trouble codes such as P0410, P0411 or related system-specific codes may be recorded when expected airflow is not detected.
- Increased cold-start emissions: A valve that fails to open may prevent the correct volume of fresh air from reaching the exhaust system.
- Failed emissions test: A defective secondary air system may contribute to emissions-related test failures, depending on the vehicle and test conditions.
- Valve stuck closed: Carbon deposits or internal mechanical damage may restrict secondary air flow.
- Valve stuck open or leaking: A damaged valve may allow exhaust gases to flow backwards into the secondary air circuit.
- Unusual air pump noises: Exhaust backflow or moisture contamination may contribute to deterioration of the secondary air pump.
- Carbon contamination: Heavy deposits inside the valve may interfere with correct operation.
- Corrosion or internal sticking: Moisture and heat exposure may cause the valve mechanism to seize.
- Damaged valve sealing surfaces: Wear or contamination may prevent the valve from sealing correctly.
- Air leakage around connections: Damaged gaskets or loose connections may reduce secondary air system efficiency.
- Repeated secondary air pump failures: Persistent pump damage may justify checking whether a leaking valve is allowing exhaust gases or condensate into the pump circuit.
- Inconsistent secondary air operation: The system may not achieve the expected airflow during engine management tests.
Why Replacement Matters:
Replacing a defective secondary air injection valve is important for maintaining the original emissions control system and protecting associated components.
A valve that remains closed may prevent fresh air from entering the exhaust passages during cold starts, reducing the effectiveness of the secondary air injection system.
A valve that fails to seal correctly may allow hot exhaust gases or contamination to travel backwards towards the secondary air pump.
If this condition continues, the pump, hoses and connecting components may be exposed to unnecessary heat and contamination.
Installing a Genuine Porsche replacement Secondary Air Injection Valve helps to:
- Restore secondary air flow: Re-establish the intended passage of fresh air into the exhaust system.
- Support reduced cold-start emissions: Help the emissions control system operate as designed.
- Maintain catalytic converter warm-up performance: Support the original cold-start emissions strategy.
- Prevent exhaust gas backflow: Restore the valve's intended reverse-flow protection.
- Protect the secondary air pump: Help prevent hot exhaust gases and contamination from reaching pump components.
- Address emissions-related warning lights: Resolve diagnostic faults where a defective valve has been confirmed as the cause.
- Maintain emissions system reliability: Replace sticking, leaking or damaged valve components.
- Prevent further contamination: Reduce unwanted exhaust deposits entering the secondary air circuit.
- Restore factory system operation: Maintain Porsche's original emissions control arrangement.
- Support successful emissions compliance: Help the vehicle meet its applicable emissions requirements when the rest of the system is functioning correctly.
- Reduce the risk of repeated repairs: Address a defective valve that may contribute to secondary air pump damage.
- Maintain Genuine Porsche quality: Use an original equipment component specified for compatible engines.
Replacement is particularly recommended when inspection confirms that the valve is stuck, blocked, leaking or unable to prevent exhaust gas backflow.
When replacing the valve, the secondary air pump, associated pipework and gasket should also be inspected to identify any underlying causes of failure.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94811320351
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
Fits:
Porsche 986 Boxster 2.5L >>1999
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98662410400
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 987 Boxster / Boxster S 2005-08
Porsche 987C Cayman / Cayman S 2005-08
Porsche 997 Carrera 2005-08 COUPE/CABRIO
Porsche 996 GT3 / GT3 RS 2004-05
Porsche 997 GT3 2007-09
Porsche 997 GT3 / GT3 RS / GT3 RS 4.0 2010-13
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760510402
The product you are viewing cross references to these numbers
Air Injection Pumps & Air Injectors – Clean Performance & Efficient Emissions for Porsche Engines
Air injection pumps and air injectors are essential components of Porsche’s secondary air injection system, designed to improve cold-start performance and reduce harmful exhaust emissions. By injecting fresh air into the exhaust manifold or catalytic converter, these parts help burn un-combusted fuel during startup, allowing the engine to warm up faster and operate more efficiently.
At Design911, we supply a comprehensive range of genuine and high-quality air injection pumps and air injectors for various Porsche modes including, 911, Boxster, Cayman, Cayenne, Macan, and Panamera models. Each component is engineered for precise airflow, quiet operation, and long-term durability — ensuring your Porsche remains compliant with emissions standards while maintaining peak performance.
What Do Air Injection Pumps & Air Injectors Do?
The secondary air injection system uses these components to
introduce clean air into the exhaust stream to support combustion and emissions
control. Specifically, they:
- Inject
fresh air into the exhaust system during cold starts.
- Accelerate
catalytic converter warm-up for cleaner operation.
- Reduce
unburned hydrocarbons and lower emission output.
- Support smooth idle and efficient fuel burn during startup.
Together, the air injection pump and injectors help your Porsche meet performance and emissions regulations, particularly under strict testing conditions.
Why Do Air Injection Pumps & Air Injectors Fail?
These components are exposed to high temperatures, moisture,
and contaminants, making them prone to wear and degradation over time. Common
causes of failure include:
- Moisture
ingress leading to internal corrosion.
- Carbon
buildup clogging injector ports or valves.
- Cracked
or leaking hoses reducing airflow efficiency.
- Electrical
or relay faults affecting pump operation.
- Contaminated air passages impairing airflow.
Symptoms of failure include rough cold starts, engine warning lights, failed emissions tests, unusual noises, or reduced performance at idle.
Why Replace Faulty Air Injection Components?
A malfunctioning air injection pump or injector can cause increased emissions, poor drivability, and potential damage to the catalytic converter. Replacing worn components restores optimal airflow, smooth operation, and regulatory compliance.
Benefits of replacement include:
- Improved cold-start performance and smoother idle.
- Reliable emissions control and efficiency.
- Prevention of catalytic converter damage.
- Long-lasting durability with manufacturer-quality precision.
All air injection components at Design911 feature high-quality materials, corrosion-resistant housings, and precision-engineered internal valves to ensure consistent airflow and long service life.
