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- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
The Air / Oil Separator to Crankcase Vent Line is a OE MATCH engine ventilation component designed to connect the air/oil separator (AOS) to the crankcase ventilation system. This line allows separated crankcase gases to be routed correctly back into the intake system while helping prevent oil vapour from entering critical engine components.
Fits:
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 1
What This Product Does:
- Routing crankcase gases from the air/oil separator
- Supporting efficient oil vapour separation
- Maintaining proper crankcase pressure regulation
- Reducing oil contamination in the intake system
- Helping prevent sludge build-up inside the engine
Symptoms Of Wear Or Failure:
- Rough idle or unstable engine performance
- Check Engine Light illumination
- Increased oil consumption
- Oil leaks from seals or gaskets
- Whistling or hissing noises (vacuum leak)
- Excessive smoke from the exhaust
- Oil residue around breather or intake components
Why Replacement Matters:
- Restore correct PCV system operation
- Prevent oil leaks and pressure-related damage
- Improve engine performance and efficiency
- Protect intake components from oil contamination
- Avoid costly engine repairs
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810722951
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
OE Match connecting vent line for the air/oil separators. This breather component forms part of the engine’s crankcase ventilation system.
Fits:
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 19
Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
The line provides the connection linking the air/oil separators, allowing ventilation gases to pass through this part of the breather assembly. It is a connecting pipe, rather than an oil separator or non-return valve.
Functions
- Connects the air/oil separator assemblies.
- Provides a passage for crankcase ventilation gases.
- Supports the intended routing of the engine breather system.
Technical Details
- Brand: OE Match.
- Internal diagram description: breather line.
- Diagram engine/model identifier: 4851.
Symptoms of Fault
Inspection is appropriate if the line becomes brittle, develops cracks or shows oily deposits around its connections. Rough idling, unusual breather noises or increased oil use can also accompany ventilation faults, but do not establish that this line is the cause.
Why Replacement Matters
Renewing a damaged connecting line helps restore a sealed ventilation path. Check the neighbouring breather pipes, connections and separator assemblies during diagnosis rather than assuming every ventilation symptom requires this component.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724553
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Vent Line – Oil Separator to Crankcase
Fits:- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Diagram ref no 1
This vent line forms part of the engine's crankcase
ventilation system, connecting the oil separator with the crankcase ventilation
circuit. It helps route blow-by gases and oil vapour correctly through the
breather system while supporting controlled crankcase pressure.
What Does the Vent Line Do?
During normal engine operation, combustion gases can pass
the piston rings and enter the crankcase. The crankcase ventilation system
manages these gases and routes oil-laden vapours through the air/oil separator
system.
This vent line provides part of that connection, allowing
vapours to move through the system while helping maintain the correct crankcase
pressure.
Why Does It Fail?
Breather and vent lines operate in a hot engine environment and are continually exposed to oil vapour.
Over time they can:
- Harden or become brittle
- Crack or split
- Develop leaks at their connections
- Become contaminated with oil residue
- Suffer damage during engine maintenance
Age-related deterioration is particularly relevant on older Cayenne models.
When Should It Be Replaced?
Inspect the vent line if there are signs of:
Visible cracking or splitting Oil residue around connections Vacuum or pressure leaks Hissing noises Rough or unstable idle PCV-related engine faults Deteriorated connector endsA damaged vent line can interfere with the operation of the crankcase ventilation system, so the associated air/oil separators and other breather hoses should also be inspected.
Checks Before Installation
When replacing the vent line, inspect:
- Air/oil separators
- Adjacent breather hoses
- Hose connections and seals
- Crankcase ventilation valves
- Intake connections
- Evidence of oil leakage
- Brittle or damaged plastic fittings
Replacing other deteriorated breather components at the same time can help avoid repeated dismantling.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724702
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
OE Match crankcase ventilation (breather) vent line that connects between the air/oil separators on the Porsche Cayenne 957 (9PA1) engine ventilation system. It supersedes older numbers 94810724501 and 94810724500.
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2007 - 2010
* Engine type 4801
Diagram ref no 19
This vent line is part of the Cayenne’s PCV / crankcase ventilation circuit, routing crankcase vapours between the separator units to keep pressure regulation stable and help return oil mist to the correct areas. It transfers crankcase vapours through the separator network so the system can manage blow-by gases effectively, reducing unwanted pressure build-up and helping limit oil vapour escape into the engine bay.
Function:
• Links the air/oil separator assemblies as part of the engine breather system
• Helps maintain correct crankcase pressure control
• Supports cleaner operation by managing oil vapour separation and routing
Breather/vent hoses live in a hot, oily environment and can harden, split, or lose sealing at the ends. A compromised vent line can contribute to vacuum/pressure leaks, oil misting, rough running, or PCV-related faults. Replacing it restores proper sealing and correct vapour routing.
When to Replace:
• Visible cracks, softness, or oil saturation on the hose
• Oil misting/residue around breather connections
• PCV-related drivability issues or fault codes
• During air/oil separator or major intake/engine-bay service
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724502
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Fits:
Porsche 957 Cayenne turbo / turbo S -2007 to 2008
Porsche 957 Cayenne turbo S / turbo 2009 to 2010 (with Enhanced performance engine)
Diagram ref no 14
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723652
The product you are viewing cross references to these numbers