Turbocharger 53039700138, 53039880138 03L145701A

The turbocharger has become one of the most significant innovations in the automotive industry, especially in the world of diesel engines where performance, 

efficiency, and emissions standards are critical. Among the many advanced turbocharger models available, 

the Turbocharger 53039700138, 53039880138, 03L145701A is specifically 

engineered for the Audi A4 B8 2.0 TDI engine with engine codes CAGA, CAGB, and CAGC. Delivering up to 170 horsepower (125 kW), 

this turbocharger exemplifies the perfect balance between power and fuel efficiency, enhancing both the driving experience and overall vehicle reliability.

1. Application and Compatibility

This turbocharger is designed for the Audi A4 B8 generation, which was produced between 2007 and 2015. 

It is compatible with several versions of the 2.0 TDI common-rail diesel engine that use the engine codes CAGA, CAGB, and CAGC. 

These engines are popular for their durability, excellent torque delivery, and efficiency, 

making them a top choice for drivers who want a balance of economy and performance.

Key vehicle compatibility includes:

• Audi A4 B8 (2007–2015) – 2.0 TDI 170 HP, 125 kW

• Engine codes: CAGA, CAGB, CAGC

• OE part number: 03L145701A

• Turbo reference numbers: 53039700138 / 53039880138

This turbocharger is a direct replacement for the original factory unit, ensuring seamless integration without the need for major modifications.

2. Technical Specifications

• Part Numbers: 53039700138, 53039880138

• OE Reference: 03L145701A

• Engine Type: 2.0 TDI (Turbocharged Direct Injection), 4-cylinder

• Power Output: 170 HP (125 kW)

• Displacement: 1968 cc

• Induction System: Turbocharged with variable geometry turbine (VGT)

• Cooling Method: Oil and water-cooled

• Exhaust Emission Compliance: Euro 5

The turbocharger features a variable geometry turbine (VNT/VGT), which adjusts the angle of the turbine blades depending on engine load and speed. 

This technology ensures quick spool-up at low RPM for better torque and reduced turbo lag,

 while also maintaining optimal boost pressure at higher RPMs for consistent performance.

3. Performance Benefits

Installing or replacing the turbocharger with the correct OE-specification unit such as 

the 53039700138 / 53039880138 / 03L145701A offers several performance advantages:

1. Improved Power Delivery – The turbocharger boosts intake air pressure, enabling the engine to burn fuel more

2. efficiently and deliver up to 170 horsepower with smooth acceleration.

3. Enhanced Torque – Particularly at low engine speeds, the VNT design improves torque output,

4. making the Audi A4 more responsive during city driving or highway overtaking.

5. Fuel Efficiency – By improving combustion efficiency, the turbocharger helps reduce fuel

6. consumption compared to naturally aspirated engines of similar power output.

7. Reduced Emissions – Optimized air-fuel combustion ensures lower particulate emissions and compliance with stringent Euro 5 standards.

8. Driving Comfort – Minimal turbo lag and smooth power distribution improve overall driving experience,

9. making both short trips and long-distance journeys more enjoyable.

4. Construction and Design Quality

Turbochargers operate under extremely harsh conditions, dealing with exhaust gases at temperatures exceeding 900°C and 

spinning at speeds of up to 200,000 RPM. To meet these challenges, the 53039700138 / 53039880138 turbocharger is built with:

• High-strength materials for the turbine housing and compressor wheel, ensuring durability under thermal stress.

• Precision balancing to minimize vibrations and extend lifespan.

• Advanced bearings (journal or thrust bearings depending on version) to reduce friction and wear.

• Oil and water cooling channels to prevent overheating and maintain stable operating temperatures.

This design guarantees long-term reliability when maintained properly, making it a trusted component for Audi diesel engines.

5. Maintenance and Service Life

Like all turbochargers, the 53039700138 / 53039880138 unit requires proper maintenance to ensure longevity. Key maintenance tips include:

1. Regular Oil Changes – Clean, high-quality engine oil is essential to lubricate the turbocharger’s bearings. Dirty or degraded oil can cause premature wear.

2. Warm-up and Cool-down – Allow the engine to warm up before high acceleration and let it idle for 1–2 minutes after long drives to cool the turbo gradually.

3. Air Filtration – A clean air filter prevents debris from damaging the compressor blades.

4. Exhaust System Check – Any leaks in the exhaust manifold or piping can affect turbo efficiency and performance.

With proper care, this turbocharger can last well over 150,000 kilometers, delivering reliable performance throughout its lifespan.

6. Replacement and Installation Notes

When replacing the turbocharger, it is critical to ensure:

• The oil supply line is clean and free of blockages.

• The intercooler is flushed to remove any oil residue from the old turbo failure.

• All gaskets and seals are replaced with new components.

• The ECU is checked or reprogrammed if necessary to adapt to the new turbocharger.

A professional installation is highly recommended to avoid issues related to incorrect fitting or inadequate lubrication.

7. Market Demand and Value

The Audi A4 B8 2.0 TDI remains a popular model across Europe and other markets due to its balance of premium comfort and diesel efficiency. 

Consequently, the demand for replacement turbochargers such as the 53039700138 / 53039880138 / 03L145701A remains strong in the aftermarket.

This turbocharger is often chosen by workshops, car owners, and distributors who require:

• OE quality replacement for failed or worn-out units.

• Restoration of original power and efficiency without modifications.

• Cost-effective solution compared to purchasing a new OEM unit directly from the dealer.

8. Conclusion

The Turbocharger 53039700138, 53039880138, 03L145701A for the Audi A4 2.0 TDI B8 (CAGA, CAGB, CAGC engines) 

represents a critical component in ensuring optimal engine performance, efficiency, and compliance with modern emission standards. 

With its advanced variable geometry turbine technology, robust construction, and direct compatibility, it delivers the perfect blend of power and economy.

Whether replacing a failed turbocharger or upgrading for improved reliability, this unit restores the Audi A4 to its intended driving 

dynamics—responsive acceleration, strong torque delivery, and excellent fuel economy. Properly maintained, it offers long 

service life and dependable performance, making it a valuable investment for both car owners and automotive service providers.