How to diagnose and replace a turbocharger and intercooler on Audi A4?

The turbocharger is an extremely delicate part that will be either crippled by insufficient lubrication or by foreign substance getting into it via the air intake duct and the symptoms of failure include poor engine performance, blue/ gray exhaust smoke, or abnormal sounds. In diagnosing suspected failure of turbocharge, looseness or damage in intake air duct, no limits to air intake system, damaged vacuum hose and wiring, no binding of actuator linkage in wastegate, and damage or restriction in exhaust system, supply of lubricating oil, drainback lines and coolant supply lines. When such checks fail to reveal the issue, a service department in a dealership or a repair facility equipped with the necessary equipment should be engaged in order to diagnose the problem. To replace the turbocharger of 1.8L models, take out the engine cover, fresh air inlet duct and air filter housing and drain engine oil and coolant. Unscrew the oil feed and coolant feed lines, lift the vehicle and get rid of the air conditioning compressor without removing the refrigerant hoses. Unscrew the air inlet and outlet ducts, unscrew the turbocharger support bracket, and unscrew the oil return line off the oil pan and be sure to spill any remaining oil. On 2.0L models, the same steps are used with the addition of the exhaust manifold heat shield and PCV fresh air inlet hose being removed, as well as multiple line banjo bolts. Installation of the new turbocharger assembly requires the replacement of all gaskets, seals, nuts, tighten all fasteners to the working torque, refuel the engine and coolant, and make sure that the engine is properly lubricated and then start the engine. To change intercooler, it is important to lift the vehicle, lay under-covers, take out radiator support depending on the model, either place the radiator support in the service position or take off the front bumper cover and headlight housing. Disassemble the air intake scoop, inlet and outlet air tube, and any structural blocking electrical connector then unmount the intercooler and the mounting bracket prior to taking off the intercooler then reassemble all damaged parts during the new mounting.

Genuine Audi A4 Intercooler

Front Intercooler

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Audi A4 Intercooler Part Number: 8K0-145-805-P
$383.18 MSRP: $536.67
You Save: $153.49 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cooler
- Replaces: 8K0-145-805-G
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Intercooler Part Number: 8E0-145-805-N
$371.86 MSRP: $520.81
You Save: $148.95 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cooler
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2006 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Cooler Assembly Part Number: 06E-145-621-S
$484.33 MSRP: $678.32
You Save: $193.99 (29%)
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Product Specifications
- Other Name: Cooler; Cooler Assembly, Intercooler
- Replaces: 06E-145-621-E, 06E-145-621-F, 06E-145-621-R
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016 Audi A4 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
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Audi A4 Intercooler Part Number: 8E0-145-806-Q
$446.60 MSRP: $625.48
You Save: $178.88 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cooler
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2007-2008 Audi A4 | Base | 4 Cyl 2.0 L GAS
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Audi A4 Intercooler Part Number: 8E0-145-805-AA
$456.23 MSRP: $638.98
You Save: $182.75 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cooler
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2009 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Intercooler Part Number: 078-145-806-L
$417.69 MSRP: $585.00
You Save: $167.31 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cooler
- Position: Right
- Replaces: 078-145-806-F, 078-145-806-K
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 6 Cyl 2.8 L GAS
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Audi A4 Intercooler Part Number: 078-145-805-N
$460.53 MSRP: $645.00
You Save: $184.47 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cooler
- Position: Left
- Replaces: 078-145-805-L, 078-145-805-M
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 6 Cyl 2.8 L GAS
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Audi A4 Intercooler Part Number: 8E0-145-806-M
$715.19 MSRP: $1001.67
You Save: $286.48 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cooler
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2009 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Intercooler Part Number: 058-145-805-G
$178.50 MSRP: $250.00
You Save: $71.50 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cooler
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1997-2001 Audi A4 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS

Audi A4 Intercooler

The Audi A4 Intercooler cools the air compressed by the turbo to enable the engine to burn more dense oxygen, increases power and prevents damaging knock. Once the charge has been squeezed by the exhaust-driven compressor and heated, the Intercooler between the turbo and the intake manifold pulls out the heat, allowing additional burning of the fuel to produce the power gains between thirty and forty percent that forced induction promises. The Intercooler efficiency also relieves stress on the pistons. Subsequent generations of Audi insert the Intercooler further up in front of the bumper, and therefore incoming air continuously cools the core to provide more stable boost, and Audi drivers notice the difference highly during a long uphill pull. There are two predominant layouts throughout the Audi range. A lighter air-to-air design conducts the charge through finned tubes, which radiate the heat directly into outside airflow, whereas an air-to-liquid design conducts the charge through a coolant jacket and then through a small radiator, which adds mass but is effective in instances where outside airflow is restricted. Over the years of production, some A4 trims were based on the first style and others were based on the compact liquid system, yet all of them pursue the same objective, namely denser air and low intake temperatures. Regardless of the installed type, Audi engineers combine it with wastegates and bypass valves that regulate boost, sparing parts and enabling a smaller motor to compete with larger powerplants in everyday highway and city driving.

Choose original equipment manufacturer Intercooler for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Intercooler at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A4 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A4 needs now.

Audi A4 Intercooler Parts and Q&A

Intercooler
8E0-145-805-AA
Q: How to diagnose and replace a turbocharger and intercooler on Audi A4?
A:
The turbocharger is an extremely delicate part that will be either crippled by insufficient lubrication or by foreign substance getting into it via the air intake duct and the symptoms of failure include poor engine performance, blue/ gray exhaust smoke, or abnormal sounds. In diagnosing suspected failure of turbocharge, looseness or damage in intake air duct, no limits to air intake system, damaged vacuum hose and wiring, no binding of actuator linkage in wastegate, and damage or restriction in exhaust system, supply of lubricating oil, drainback lines and coolant supply lines. When such checks fail to reveal the issue, a service department in a dealership or a repair facility equipped with the necessary equipment should be engaged in order to diagnose the problem. To replace the turbocharger of 1.8L models, take out the engine cover, fresh air inlet duct and air filter housing and drain engine oil and coolant. Unscrew the oil feed and coolant feed lines, lift the vehicle and get rid of the air conditioning compressor without removing the refrigerant hoses. Unscrew the air inlet and outlet ducts, unscrew the turbocharger support bracket, and unscrew the oil return line off the oil pan and be sure to spill any remaining oil. On 2.0L models, the same steps are used with the addition of the exhaust manifold heat shield and PCV fresh air inlet hose being removed, as well as multiple line banjo bolts. Installation of the new turbocharger assembly requires the replacement of all gaskets, seals, nuts, tighten all fasteners to the working torque, refuel the engine and coolant, and make sure that the engine is properly lubricated and then start the engine. To change intercooler, it is important to lift the vehicle, lay under-covers, take out radiator support depending on the model, either place the radiator support in the service position or take off the front bumper cover and headlight housing. Disassemble the air intake scoop, inlet and outlet air tube, and any structural blocking electrical connector then unmount the intercooler and the mounting bracket prior to taking off the intercooler then reassemble all damaged parts during the new mounting.