Air Injection Pressure Line, Cyl. 1–3. Porsche 997.1 / 997.2 Turbo / GT2 / GT2 RS M97.70 2007-11  ›  99711311170

The Genuine Porsche Air Injection Pressure Line is a replacement component for the secondary air-injection system serving cylinders 1–3 on selected Porsche 911 (997) Turbo, GT2 and GT2 RS models.

Fits:

• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT2 2007-09
• Porsche 997 MKII Turbo 2010-11
• Porsche 997 MKII GT2 RS 2011  

Because the system relies on controlled airflow, the pressure line must remain sealed, unrestricted and securely connected. Cracks, leaks, damaged connections or internal restriction can reduce secondary-air flow and may trigger emissions-related engine-management faults.

What This Product Does:
The air-injection pressure line transports air supplied by the secondary-air system towards the exhaust side of cylinders 1–3.

It is designed to:

• Carry secondary air to cylinders 1–3.
• Form part of the engine's emissions-control system.
• Help introduce additional oxygen into the exhaust stream during cold-start operation.
• Support faster catalytic converter light-off.
• Help reduce cold-start exhaust emissions.
• Maintain a sealed air path between secondary-air components.
• Support correct secondary-air system monitoring by the engine-management system.
• Replace a cracked, leaking, restricted or damaged original pressure line.
• Help restore correct secondary-air flow after an emissions-system fault.

• Check Engine Light illuminating.
• Secondary-air injection fault codes.
• Insufficient secondary-air flow faults.
• Emissions-related diagnostic faults affecting the cylinder 1–3 bank.
• Hissing or blowing noise during cold-start secondary-air operation.
• Air escaping from a cracked line or damaged connection.
• Visible cracks or splits.
• Loose or damaged connections.
• Deteriorated sealing points.
• Secondary-air pump operating but expected airflow not reaching the engine.
• Increased cold-start exhaust emissions.
• Failed emissions or inspection testing where applicable.
• Repeated secondary-air system faults after other components have been checked.

Because the system operates primarily during specific cold-start conditions, a damaged pressure line may produce few noticeable drivability symptoms during normal warm-engine operation.

Why Replacement Matters:
The secondary-air system depends on a sealed route between the pump, control valves and exhaust injection points.

A leaking pressure line allows some of the supplied air to escape before reaching cylinders 1–3.

This can cause the engine-management system to detect insufficient secondary-air flow.

Replacing a faulty line helps restore:

• Correct secondary-air delivery.
• Proper system sealing.
• Reliable cold-start emissions control.
• Correct catalytic converter warm-up strategy.
• Reduced likelihood of secondary-air diagnostic faults.
• Proper operation of the cylinder 1–3 air-injection circuit.