Crankcase Housing Ventilation Hose. Porsche 996 / 997.1 1998-08

Crankcase Housing Ventilation Hose.
Ensure reliable crankcase ventilation on your Porsche with this genuine OEM breather hose. Designed to connect the crankcase/bleed port to the PCV/intake system, this hose helps maintain correct vacuum/pressure balance, removes oil vapour efficiently and supports engine health in models such as the 911 (996 / 997.1 series).

Fits:

• 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 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08

Diagram Ref No 19

What This Product Does:

• The crankcase ventilation hose provides a path for filtered crankcase gases (blow-by, vapours, oil mist) to be routed from the engine’s crankcase or oil separator back into the intake or PCV (positive crankcase ventilation) system rather than being vented uncontrolled.
• It helps maintain correct engine vacuum/pressure balance within the crankcase, removes oil vapours, prevents buildup of excess pressure that could cause leaks or gasket failures, and supports emissions compliance.

Symptoms Of Wear Or Failure:

• Visible cracks, splits or brittleness in the hose; rubber/engine bay hoses degrade under heat/oil/vapour over time.
  
• Oil residue, grime or wetness around the hose or its connectors — if vapour is leaking, you may see oil-moisture deposit around the breather circuit.
  
• Mis-fires, rough idle or engine running poorly — because un-metered air (via a damaged breather hose) may be introduced, altering the air/fuel ratio.
  
• Check Engine Light (CEL) or fault codes concerning intake air leak, crankcase pressure or PCV system faults.
  
• Oil smells in the engine bay / smoke from the breather area — indicating the hose may no longer be securing the vapours correctly.
  
  

Why Replacement Matters:

• Protects engine internals & seals: Proper ventilation prevents excessive crankcase pressure which can force oil past seals or gaskets, causing leaks or damage.
  
• Maintains performance & emissions: A damaged breather hose can upset engine vacuum and air-fuel mixture, affecting power, idle quality and emissions.
  
• Prevents bigger failures: A failing hose is inexpensive; ignoring it could lead to more costly repairs (seal replacement, engine bay oil contamination, intake system clean-up).

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99610622352

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