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Valves
By OE Match
- Porsche 996 TURBO 2000-05
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
Ensure your Porsche’s emissions system performs flawlessly with this OE Match secondary air injection solenoid valve (99660515500). Engineered to replicate the original Porsche design, this valve controls the vacuum signal that activates the secondary air injection system, allowing fresh air to enter the exhaust stream during cold starts, reducing emissions and supporting cleaner combustion.
The valve provides consistent vacuum control and quick response, restoring the proper function of the secondary air system and preventing check-engine light faults (often P0410/P0411)
Fits:
Porsche 996 turbo - 2000 to 2005
Porsche 996 GT3 Mk2 - 2004 to 2005
Porsche 955 Cayenne turbo - 2003 to 2006
Porsche 957 Cayenne turbo - 2007 to 2010
Porsche 958 Cayenne turbo V8 - 2010 to 2017
Porsche 970 Panamera turbo V8 - 2009 to 2016
Diagram ref no 44
Function:
This valve regulates vacuum flow to the secondary air injection pump and combination valves, enabling the system to inject fresh air into the exhaust manifold during engine warm-up. This helps burn uncombusted hydrocarbons, reducing emissions and ensuring smooth cold starts.
Why & When Replacement Matters
Why:
A failing solenoid valve can cause improper secondary air operation, resulting in rough cold starts, increased emissions, or illuminated check-engine lights.
When:
- If diagnostic codes P0410/P0411 (secondary air system malfunction) appear
- When air pump or combination valves are replaced
- During emissions or intake system service on high-mileage engines
Replacing with an OE Match solenoid valve restores proper air injection control, improves cold-start behaviour, and ensures compliance with emissions standards.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660515500
The product you are viewing cross references to these numbers
OEMatch Valves — Fit, Function, Confidence
Valves for Porsche models control the flow of air, gases and crankcase ventilation within emissions and auxiliary systems and influence cold-start behaviour and exhaust treatment. OEMatch valves are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable.
- Secondary air injection (combi) valves
- Vacuum-operated check valves
- Solenoid-controlled purge and exhaust valves
- Positive crankcase ventilation (PCV) valves
Understanding OEMatch Valves
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche's original valves.
OE (Original Equipment) refers to parts matching original specifications for the valves and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM valves engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Valves used in Porsche systems are small but function-critical items that regulate airflow, direct secondary air for emissions control, or manage crankcase and evaporative purge paths. They sit close to the engine and exhaust, so they are exposed to heat, condensation and combustion by-products. The design and materials vary with function; some are vacuum-operated diaphragms, others are electrically actuated solenoids or simple one-way check valves. Correct selection and correct installation are important to maintain engine management behaviour and emissions equipment performance.
Benefits Include
- Restored cold-start behaviour and more predictable engine idling
- Improved emissions control by ensuring correct secondary air or purge flow
- Reduced risk of downstream component stress such as on catalytic converters
Why Valves Wear and Fail
- Carbon and soot build-up can restrict movement or sealing surfaces
- Corrosion from condensation and exhaust moisture degrades housings and diaphragms
- Seal, diaphragm or spring fatigue leading to sticking or leaks
- Electrical faults or wiring/connectors affecting solenoid-operated units
The Importance of Replacing with OEMatch Valves
Using a correctly specified replacement helps preserve emissions control, maintains the expected behaviour of engine management systems, and reduces the likelihood of diagnostic faults or failed inspections. For Porsche models, a valve that matches original dimensions and mounting interfaces avoids interference with nearby manifolds, sensors and wiring looms and supports consistent system operation.
Advantages
- Manufactured to original-spec dimensions where applicable to fit factory mounting points and clearances
- Cross-reference coverage to match common Porsche part numbers and application variants
- Materials and sealing designed for exposure to heat, oil vapour and exhaust moisture
