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Home >> Audi >> 2025 >> S4 Premium >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Turbocharger, Supercharger (6-Cylinder Direct Fuel Injection 2.9L; 3.0L 4V TFSI Engine Ea 839) >> 21 Turbocharger, Supercharger >> Charge Air System >> Air Duct Pipe, Removing And Installing >> Air Duct Pipe, Removing And Installing, With Radiator Installed 2.9L Engine >> Removing

Air Duct Pipe, Removing And Installing, With Radiator Installed 2.9L Engine: Removing

-- Pay attention to the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Remove the ribbed belt from the A/C compressor. Refer to RIBBED BELT, REMOVING AND INSTALLING .

-- Move the tensioner for the A/C compressor to the side. Refer to RIBBED BELT TENSIONER, REMOVING AND INSTALLING .

-- Remove the air filter housing. Refer to AIR FILTER HOUSING, REMOVING AND INSTALLING .

-- Disconnect the connector and free up the wiring harness.

GWWA21-11248Courtesy of AUDI OF AMERICA, LLC
  1. For the Charge Air Cooler Temperature Sensor 2 -G764-
  2. For the Charge Air Cooler Temperature Sensor 1 -G763-

-- Remove the oil filter element. Refer to Maintenance Work; Engine Oil; Oil Filter, Replacing, and cover the opening with a clean cloth.

-- Remove the bolts -arrows-.

GWWA21-11249Courtesy of AUDI OF AMERICA, LLC

-- Remove the crankcase ventilation hose -2- by pressing the release buttons on both sides.

-- Move the air duct pipe -1- to the side.

-- Remove the cover.

GWWA13-11226Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolt -arrow- and the idler roller.

-- Free up the coolant line -2-.

GWWA21-11222Courtesy of AUDI OF AMERICA, LLC

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Vehicles with version 1 charge air system:

-- Loosen the hose clamps -1 and 3- and remove the air duct hose.

Vehicles with version 2 charge air system:

GWWA21-11567Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connector -2- for the Charge Air Pressure Sensor -G31-.

-- Loosen the hose clamps -arrows- and remove the air duct pipe -1-.

Continuation for All Vehicles:

GWWA21-11250Courtesy of AUDI OF AMERICA, LLC

-- Press the release buttons on both sides and remove the EVAP system hose -arrow-.

-- Free up the wiring harness.

GWWA24-11724Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows-, use the Long Reach Special Wrench : T40398  if necessary.

-- Remove the crankcase ventilation hose -1- by pressing the release buttons on both sides.

-- Disconnect the connector and free up the wiring harness -2-.

GWWA21-11132Courtesy of AUDI OF AMERICA, LLC

-- Remove the vacuum hose -6- and hose -3- for the crankcase ventilation to do so press the release buttons on both sides.

-- Remove the bolts -arrows-, use the Long Reach Special Wrench : T40398  if necessary.

-- Carefully pivot the air duct pipe -1- to the left side.

-- Loosen the screw-type clamp -2- and remove the air duct hose.

GWWA21-11280Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -arrows-, use the Insert Tool :T10572  if necessary.

-- Remove the lower ventilation pipe. -1-.

-- Remove the upper ventilation pipe.