Engine oil separator breather hose. Porsche 997.1 Carrera S / 4S  ›  99710714502

Vent line from valve cover to crankcase
Vent line from the valve cover to the crankcase by OE Match for the Porsche 955 Cayenne Turbo 4.5L from 2003–06. This replacement line forms part of the M48.50 engine crankcase ventilation system.

Fits:
Porsche 955 Cayenne Turbo 4.5L 2003 - 2006

Diagram ref no 12

What This Product Does

The vent line provides a route between the valve cover and crankcase, allowing crankcase gases to move through the engine ventilation system. Correct ventilation helps manage crankcase pressure and limits the escape of oil mist around damaged or poorly sealed connections.

Functions

• Routes crankcase gases through the ventilation system
• Connects the valve cover and crankcase ventilation circuit
• Helps maintain controlled crankcase pressure
• Supports the management of oil vapour within the breather system

Technical Details

• Brand: OE Match
• Part type: valve cover-to-crankcase vent line
• OE reference: 94810721552
• Engine application: M48.50 4.5L V8
• Assembly: valve cover and engine cover
• Diagram ref no 12

Symptoms of Fault

• Cracks or brittleness in the existing vent line
• Oil mist or seepage around the hose connections
• Whistling or unusual noises from the crankcase area
• Rough or unstable idle caused by an air leak
• Increased oil consumption or smoke
• Abnormal crankcase vacuum

Why Replacement Matters

Age, engine heat and repeated pressure cycles can cause a breather line to harden, split or lose its seal. Replacing a damaged line helps restore the intended ventilation route and reduces the risk of vacuum leaks, oil residue and unstable crankcase pressure. Inspect adjoining seals, fittings and breather components during installation, as deterioration elsewhere in the system can produce similar symptoms.

OE Reference

• 94810721552

FAQs

• Does smoke always indicate a failed vent line? No. Smoke can also be associated with the oil separator, an incorrect oil level or internal engine faults, so diagnosis is recommended.
• Should connected components be inspected? Yes. Check the breather connections, seals and nearby hoses for cracks, oil contamination or poor sealing.
• Is this a Genuine Porsche component? This listing is for an OE Match replacement. The supplied OE reference should be used to confirm the required application.
• Which engine is this line associated with? The supplied diagram identifies it for the M48.50 engine used in the listed 955 Cayenne Turbo application.

Fits:
Porsche 955 Cayenne 3.2L  (engines 022Y)

Click 'Zoom in' for large parts diagram.
Diagram ref no 27

Fits:
Porsche 955 Cayenne 3.2L  (engines 022Y)

Click 'Zoom in' for large parts diagram.
Diagram ref no 27