Breather line, Cyl 4-6. Porsche 997.1 Carrera 2S / 4 / 4S 3.8L  ›  99710714603

OE Match breather line for cylinders 4–6 on the listed Porsche 997.1 Carrera applications, this pipe connects the primary and secondary oil separators within the crankcase ventilation system.

Fits

• Porsche 997.1 Carrera 4/ Carrera 4S 3.8L 2004-08
• 997 MK1 Carrera 2S 3.8L 2005-08
• 997 MK1 Carrera 4S 3.8L 2005-08
  
  

Diagram ref no: 5


Check fitment for your specific vehicle (model, year, engine) before ordering.

What This Product Does

The line provides a passage between the oil separators, allowing crankcase gases to move through the ventilation circuit. It is a connecting pipe rather than an oil separator: oil separation takes place in the associated separator units.

Functions

• Connects the primary and secondary separator units.
• Carries ventilation gases through the cylinders 4–6 circuit.
• Provides a sealed connection within the breather system.
  
  

Technical Details

• Part reference: 99710714603.
• Brand: OE Match.
• Component: crankcase breather / vent line.
• Cylinder assignment: 4–6.
• Connection: primary separator to secondary separator.
  
  

Symptoms of Fault

Inspect the ventilation pipework if there is visible cracking, oil mist near a connection, an uneven idle or a whistling sound. Increased oil use and exhaust smoke can also accompany ventilation-system faults, but these symptoms do not establish that this particular line has failed.

Why Replacement Matters

A damaged or obstructed pipe can affect the ventilation circuit. Renewing a confirmed faulty line addresses that defect; it does not repair a failed separator or another source of oil consumption. During replacement, examine adjoining connections, seals and supporting components for deterioration.

FAQs

Does exhaust smoke prove the breather line needs replacing?
No. Separator faults, an incorrect oil level and other engine problems can produce similar signs. Establish the cause before selecting replacement parts.

What should be checked alongside this pipe?
Inspect neighbouring breather lines, separator connections and seals. Check the engine oil level as part of the diagnosis.

How should compatibility be confirmed?
Compare reference 99710714603 with the original component and verify the model, engine and production details. The supplied diagram identifies this line for the M97.01 3.8L application.

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Related, superseded, cross reference or alternative numbers for comparison.

99710714603

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