Turbocharger 753420-0004 753420-0005

The GT1544V turbocharger, referenced under part numbers 753420-0004, 753420-0005, and 9663199280, is a high-precision, 

variable geometry turbo (VGT) system designed to optimize performance and efficiency in Citroen 1.6 HDI diesel engines.

 It is commonly installed in models such as the Citroen Berlingo, C2, C4, C5, and Xsara Picasso, 

where it plays a vital role in delivering a balance of power, fuel economy, and low emissions.

1. Application and Compatibility

This turbocharger is engineered specifically for PSA Group’s 1.6 HDI engines—a widely used diesel powerplant known for its 

smooth torque delivery and strong fuel efficiency. Typical compatible vehicles include:

• Citroen Berlingo 1.6 HDI

• Citroen C2 1.6 HDI

• Citroen C4 1.6 HDI

• Citroen C5 1.6 HDI

• Citroen Xsara Picasso 1.6 HDI

The engine codes often associated with this turbo are DV6TED4, 9HX, and other 1.6 HDI variants. 

Before purchase or installation, it is important to cross-check the part number from the original 

turbocharger and confirm compatibility with the specific vehicle year and engine code.

2. Technical Overview

The GT1544V belongs to the Garrett GT15 family of turbochargers and features variable geometry technology. 

The key technical specifications include:

• Model: GT1544V

• Part Numbers: 753420-0004, 753420-0005, 9663199280

• Turbo Type: Variable Geometry Turbocharger (VGT / VNT)

• Bearing System: Journal bearing

• Compressor Wheel: Lightweight aluminum alloy design for fast spool

• Turbine Housing: High-temperature-resistant cast iron

• Actuation: Vacuum-controlled VNT actuator

3. Working Principle

The variable geometry design allows the turbo to adapt the turbine inlet vane position according to engine load and RPM:

• Low engine speed: The vanes close to accelerate exhaust gas velocity, enabling faster turbine rotation, which reduces turbo lag and boosts low-end torque.

• High engine speed: The vanes open to allow more exhaust gas flow without creating excess backpressure, sustaining power while protecting the turbo from overspeeding.

This flexibility ensures optimal boost pressure across a wide RPM range, delivering both responsive acceleration and fuel efficiency.

4. Performance Benefits

1. Improved Low-End Torque – Enhanced drivability in city conditions, making acceleration smoother.

2. Higher Power Output – Maintains optimal boost levels, allowing the 1.6 HDI engine to produce reliable power even under load.

3. Fuel Efficiency – Reduces wasted energy by matching turbo output to driving demand.

4. Reduced Turbo Lag – Quick spool response for better throttle reaction.

5. Lower Emissions – Works seamlessly with EGR systems and catalytic converters to meet Euro emissions standards.

5. Common Signs of a Worn or Failing Turbocharger

Like all turbochargers, the GT1544V is subject to wear over time, especially if oil maintenance is neglected. Warning signs include:

• Loss of power and slow acceleration

• Excessive exhaust smoke (blue or black)

• Whining or siren-like noises from the turbo area

• Oil leaks around compressor housing or intercooler pipes

• Check Engine Light triggered with boost-related fault codes

If these symptoms occur, prompt inspection and, if necessary, turbo replacement is recommended to prevent further engine damage.

6. Installation Guidelines

Proper installation is critical to the longevity of the GT1544V turbocharger. Key recommendations include:

1. Oil System Check – Flush the oil feed lines, replace the oil feed pipe if blocked, and use manufacturer-approved engine oil.

2. Air Filtration – Replace the air filter to prevent debris from damaging the compressor wheel.

3. Intercooler Cleaning – Ensure the intercooler is free from old oil deposits to prevent contamination.

4. Gasket Replacement – Always install new gaskets and seals to prevent leaks.

5. Priming the Turbo – Pre-lubricate the turbo by filling the oil inlet before starting the engine.

6. Initial Idle Run – Allow the engine to idle for a few minutes after installation to stabilize oil flow before revving.

7. Maintenance Tips for Longer Service Life

• Regular Oil Changes – Every 8,000–10,000 km using high-quality synthetic oil.

• Warm-Up and Cool-Down – Avoid hard acceleration immediately after starting and let

• the engine idle for 30–60 seconds before shutdown to cool the turbo.

• Monitor Boost Levels – If equipped with a boost gauge, watch for unusual spikes or drops.

• Clean Intake System – Prevent carbon buildup that can obstruct airflow and damage the VNT mechanism.

8. OEM Quality and Replacement Options

The GT1544V with part numbers 753420-0004, 753420-0005, and 9663199280 is manufactured by Garrett, 

a global leader in turbocharging technology. Many replacement units are available as:

• Brand-new OEM turbos – Built to original factory specifications.

• Rebuilt or remanufactured turbos – Original units disassembled, cleaned, and restored with new bearings, seals, and balanced components.

Choosing an OEM-quality unit ensures the same performance and durability as the factory-fitted turbocharger.

9. Conclusion

The GT1544V turbocharger is a vital performance component for Citroen’s 1.6 HDI diesel engines, offering the ideal mix of responsiveness, 

efficiency, and emission control. Whether fitted in a Berlingo, C2, C4, C5, or Xsara Picasso, this turbo is engineered to meet the 

rigorous demands of both urban driving and long-distance travel.

With proper maintenance and timely replacement when needed, the GT1544V will continue to deliver smooth power, low fuel consumption, 

and reliable operation for many thousands of kilometers. For any replacement project,

 always verify part numbers (753420-0004, 753420-0005, 9663199280) to ensure correct fitment and optimal performance.