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.jpg?width=440&height=320 "Engine Crankcase Breather Kit Porsche 957 Cayenne S / GTS 4.8L 2009-2010 - 94810723602, 94810723601, 94810723501, 94810524504, 94810724702, 94810724502")
- Porsche 957 Cayenne S/GTS 4.8L 2007-10
Engine Crankcase Breather Hose Kit (Silver lids)
The engine crankcase breather hose is a key part of your vehicle’s positive crankcase ventilation (PCV) system. Its main role is to route pressurized gases from the engine crankcase to the PCV valve (also called the air/oil separator). The PCV valve captures harmful oil vapers , drains them back into the engine, and redirects the cleaned air to the intake system to be burned during normal combustion.
Without a properly functioning breather hose, your engine can develop performance issues, oil leaks, and even emissions failures.
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2009 - 2010
Why the Engine Crankcase Breather Hose Matters
During combustion, engines naturally produce positive crankcase pressure. This pressure combines with heat and oil vapers inside the crankcase. The breather hose is designed to handle this flow and keep your PCV system working efficiently.
Over time, however, exposure to heat, oil, and pressure makes the breather hose a common failure point. When damaged, it can cause poor performance, check engine lights, and increased emissions.
Common Symptoms of a Failing Crankcase Breather Hose
- Cracks, leaks, or breaks – Heat and oil vapers degrade rubber or plastic over time, leading to air leaks.
- Broken connectors or clips – Brittle plastic can snap during service or due to age.
- Visible damage – Hoses may split, soften, or harden, creating noticeable holes.
- Check Engine Light (CEL) – Unmetered air from a leak often triggers intake-related fault codes.
- Engine misfires or rough idle – Severe air leaks upset the air/fuel mixture, causing misfires.
Oil residue or odour – Escaping vapers leave oily deposits on the hose, engine block, and nearby components. In severe cases, you may smell burning oil.
Why You Shouldn’t Ignore a Bad Breather Hose
A faulty crankcase breather hose affects engine performance, fuel efficiency, and emissions compliance. Left untreated, it can cause long-term engine damage and costly repairs.
If you notice any of the above signs, it’s important to inspect and replace your crankcase breather hose as part of regular PCV system maintenance.
Diagram ref no 13 (Cyl 1-4) or 14 (Cyl 5-8)
NOTE: This part is compatible only with 957 Cayenne S/GTS models produced from the 2009 model year onwards. It is not compatible with earlier models equipped with the silver AOS.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723501
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Vapour block kit for water shield air cleaners. 
Fits:
Porsche 911 - 1965 to 1989
Mounted Inline between the engine oil tank and the evaporative unit, the PMO Vapor Block Kit is used to limit the amount of oil vapor that enters the induction system when using Water Shield Air Cleaners.
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- Porsche 911 1984-1986 3.2L
- Porsche 911 1978-1989 3.3L Turbo (930)
Fits:
Porsche 911 Turbo 3.3L 1981>>1983
Porsche 911 1984>>1986
Diagram Ref No 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90010401502
The product you are viewing cross references to these numbers