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Your Vehicle  //  Porsche  //  991 (911) MK2 2016-2019  //  Any
Porsche991 (911) MK2 2016-2019Engine Rebuild PartsFuel System Parts

Fuel Injectors

Fuel Injectors

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High Pressure Fuel Injector. Porsche 991.2 turbo / turbo S / GT2 RS - 9A111022231
2
High Pressure Fuel Injector. Porsche 991.2 turbo / turbo S / GT2 RS
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9A111022231
Product Information
Product Information

High Pressure Fuel Injector
Sold each - 6 required per car

The injector delivers precisely measured fuel directly into the combustion chamber under high pressure, ensuring efficient combustion, smooth engine operation and consistent performance.

Fits:

  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19

Diagram Ref No 5

Manufactured to Porsche's original specifications, it provides the correct fuel delivery characteristics for these high-performance engines.

What Does the High Pressure Fuel Injector Do?

The injector sprays a precisely controlled quantity of petrol directly into the engine's combustion chamber.

Working with the engine management system and high-pressure fuel pump, it ensures accurate fuel delivery during idling, acceleration and high engine loads.

Correct injector operation is essential for maintaining engine power, fuel efficiency, smooth running and reliable combustion.

Why Do High Pressure Fuel Injectors Fail?

Fuel injectors operate under extreme pressure and temperature conditions. Over time, they can develop problems caused by:

  • Carbon deposits restricting the injector spray nozzle.
  • Contaminated fuel or fine particles damaging internal components.
  • Wear of internal injector valves and seals.
  • Electrical faults affecting injector operation.
  • Heat cycling and prolonged high-performance engine use

A faulty injector can cause uneven fuel delivery, misfires, poor acceleration and increased fuel consumption.

When Should the Injector Be Replaced?

Replacement should be considered when an injector is confirmed faulty, leaking or unable to deliver the correct quantity of fuel.

Common symptoms include:

  • Rough idling or engine misfires.
  • Hesitation during acceleration.
  • Reduced engine performance.
  • Increased fuel consumption.
  • Engine warning light illumination.
  • Fuel mixture or cylinder misfire fault codes.
  • Difficult starting or excessive exhaust emissions.

A malfunctioning injector can cause incorrect air-fuel mixtures and potentially damage the engine or catalytic converter if left unresolved.

Checks and Diagnosis

Before replacing an injector, check the engine fault codes, fuel rail pressure and individual cylinder misfire data.

Inspect the fuel supply system and injector electrical connections. Where necessary, carry out injector performance and leakage testing to confirm the fault.

High-pressure fuel systems require specialist depressurisation and installation procedures. Replace associated seals and mounting components as specified by Porsche.

Key Features

  • Provides precise high-pressure fuel delivery.
  • Supports accurate combustion and engine performance.
  • Helps restore smooth idling and acceleration.
  • Manufactured to original Porsche specifications.
  • Six injectors required for a complete engine set.

Product Category Description – Porsche 991.2 Turbo & GT2 RS Fuel Injectors

High-pressure fuel injectors are essential components of the Porsche 991.2 Turbo, Turbo S and GT2 RS direct fuel injection systems. They deliver precisely controlled fuel quantities into each cylinder, ensuring efficient combustion and consistent engine performance.

Faulty or contaminated injectors can cause misfires, poor throttle response, increased fuel consumption and reduced engine power.

Replacing a defective injector helps restore accurate fuel delivery, reliable combustion and the performance expected from Porsche's turbocharged engines.



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

9A111022231
9A111022231

The product you are viewing cross references to these numbers
High Pressure Fuel Injector. Porsche 991.2 turbo / turbo S / GT2 RS - 9A111022231
2
High Pressure Fuel Injector. Porsche 991.2 turbo / turbo S / GT2 RS
9A111022231/1
Product Information
Product Information

High Pressure Fuel Injector
Sold each - 6 required per car

This OE Match High Pressure Fuel Injector is a replacement for the original injector fitted to the Porsche 991.2 Turbo, Turbo S and GT2 RS 3.8-litre twin-turbocharged petrol engines.

Fits:

  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19

Diagram Ref No 5

Designed to deliver precisely controlled quantities of fuel directly into the combustion chamber, it helps maintain efficient combustion, smooth engine operation and consistent power delivery.

An OE Match alternative to the Genuine Porsche injector, it provides a replacement option for restoring correct fuel injection performance.

What Does the High Pressure Fuel Injector Do?

The injector delivers a precisely measured spray of petrol directly into the combustion chamber.

Working with the high-pressure fuel pump and engine management system, it controls fuel delivery during idling, acceleration and high engine loads.

Accurate injection is essential for maintaining engine performance, fuel efficiency and smooth combustion.

Why Do High Pressure Fuel Injectors Fail?

Fuel injectors operate under extreme pressures and temperatures, making them susceptible to wear and contamination.

Common causes include:

  • Carbon deposits restricting injector nozzles.
  • Contaminated petrol damaging internal components.
  • Wear of injector valves and sealing surfaces.
  • Electrical faults affecting injector operation.
  • Prolonged exposure to high temperatures and engine vibration.

A failing injector can cause uneven fuel delivery, rough running, engine misfires and reduced performance.

When Should the Injector Be Replaced?

Replacement is recommended when an injector is diagnosed as faulty, leaking or unable to deliver the correct fuel quantity.

Common warning signs include:

  • Rough idling or engine misfires.
  • Hesitation or loss of power during acceleration.
  • Increased fuel consumption.
  • Difficult starting.
  • Engine management warning light.
  • Fuel mixture or cylinder misfire fault codes.
  • Irregular engine operation under load.

A defective injector can cause incorrect combustion and potentially damage the engine or catalytic converter if left unresolved.

Checks and Diagnosis

Before replacing the injector, check for stored engine fault codes, inspect fuel rail pressure and identify any cylinder-specific misfires.

Injector electrical connections, fuel delivery and leakage should also be checked to confirm the fault.

High-pressure fuel systems require specialist installation procedures. Associated seals and mounting components should be replaced where specified by Porsche.

Key Features

  • OE Match replacement high-pressure fuel injector.
  • Suitable for 3.8L twin-turbocharged DFI engines.
  • Provides precise fuel delivery into the combustion chamber.
  • Supports efficient combustion and engine performance.
  • Helps restore smooth idling and throttle response.
  • Replacement alternative to the Genuine Porsche injector.
  • Six injectors required for a complete engine set.

Product Category Description – Porsche 991.2 Turbo & GT2 RS Fuel Injectors

OE Match high-pressure fuel injectors provide a replacement solution for the direct fuel injection systems fitted to Porsche 991.2 Turbo, Turbo S and GT2 RS engines.

These precision components deliver accurately measured fuel quantities directly into the combustion chambers, supporting efficient combustion, consistent power delivery and smooth engine operation.

Faulty or contaminated injectors can cause misfires, poor acceleration, increased fuel consumption and reduced engine performance.



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

9A111022231
9A111022231

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
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About Fuel Injectors

Fuel Injectors – Precision Fuel Delivery for Porsche Performance and Efficiency

Fuel injectors are a crucial component in your Porsche’s engine management system, ensuring the precise amount of fuel is delivered to each cylinder for clean, efficient combustion. A properly functioning injector optimises power output, throttle response, and fuel economy — maintaining the performance standards Porsche is known for.

At Design911, we offer a comprehensive range of  fuel injectors designed for Porsche models old and new — from air-cooled classics to the latest turbocharged engines. Built to manufacturer-quality standards using advanced materials and precision nozzles, our injectors ensure accurate fuel atomisation, consistent spray patterns, and long-term durability under extreme temperatures and pressures.

Whether you’re restoring a 911, maintaining a Cayman, or upgrading for performance driving, our injectors are engineered to deliver clean, efficient combustion and consistent engine response.

What Do Fuel Injectors Do?

Fuel injectors are electronically controlled valves that deliver precise amounts of pressurised fuel into the combustion chamber or intake manifold.

Core Functions:

  • Atomise and inject fuel for efficient combustion.
  • Ensure consistent air-fuel ratio across all cylinders.
  • Improve engine responsiveness, power, and economy.
  • Support emissions control by maintaining clean, complete fuel burn.

Every Porsche engine relies on its injectors for accurate fuel delivery — a vital factor in maintaining both performance and efficiency.

Why Do Fuel Injectors Fail?

Fuel injectors are exposed to heat, pressure, and fuel impurities, making them prone to gradual wear or clogging over time.

Common Causes of Failure Include:

  • Fuel contamination, leading to clogging or restricted flow.
  • Carbon build-up on the nozzle tips, disrupting spray pattern.
  • Electrical or coil failure, affecting signal timing.
  • Internal leaks due to seal deterioration or corrosion.
  • Ethanol degradation, which can damage internal components.

Symptoms of injector failure include rough idling, poor acceleration, increased fuel consumption, misfires, or difficulty starting — all signs of inconsistent fuel delivery.

Why Replace with Precision-Engineered Fuel Injectors?

Replacing worn or clogged injectors restores proper fuel delivery, maximising power, smoothness, and efficiency. Our performance-grade, direct-fit injectors are designed to provide consistent fuel flow, superior atomisation, and long service life.

Key Benefits:

  • Restores power and throttle response.
  • Improves fuel economy and engine smoothness.
  • Prevents misfires, stalling, and hard starts.
  • Reduces emissions through cleaner combustion.
  • Crafted from high-quality, corrosion-resistant materials.
  • Direct-fit design for easy installation and long-term reliability.

Perfect for preventative maintenance or performance upgrades, these injectors deliver manufacturer-level precision and durability for every Porsche engine.

Highlights:

  • High-quality replacement fuel injectors for Porsche models.
  • Precision-engineered nozzles for accurate atomisation.
  • Tested for pressure stability and spray accuracy.
  • Improves power, efficiency, and emissions performance.
  • Compatible with classic and modern Porsche engines.
  • Essential for restorations, rebuilds, and tuning projects.

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