Removing Air Box For Throttle Housing (Y-Shaped Pipe Ahead Of Throttle Valve)

Naturally aspirated engines => 

1. On naturally aspirated engine: Loosen the screw-type clamps and pull off intake pipes and Y-shaped pipe -3, 1 or 2 -  .

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   Intake pipes

   Turbo engines => 

2. Disconnect connector -1-  for boost pressure sensor.

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   Boost pressure sensor

3. Lever off clip under the Y-pipe using a screwdriver.

1. Release both locking pins on the Y-shaped pipe in a clockwise direction and pull them off. Pull Y-shaped pipe off the throttle housing.
   Fig 1: Turbo Pressure Pipes Ahead Of Throttle Valve Components Location

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   Turbo pressure pipes ahead of thro tie valve

   1	Pressure pipe
   2	Y-shaped pipe
   4	PCV line (positive crankcase ventilation); hose connector fitted in check valve or Y-shaped pipe, depending on equipment => Important! Only loosen connections if you intend to replace them and replace clamps! Set components down with the ventilation pipes and lines connected.
   5	Control line for ambient air line

   Either release the clips on the plug-in connection -1-  for the charge air cooler if necessary and pull the pressure pipes of the charge-air cooler. Turn the Y-shaped pipe with pressure pipes fitted around and detach the control line -5-  , which is clipped on.

   Or loosen the screw-type clamps between the Y-shaped pipe and pressure pipes and turn the Y-shaped pipe around and detach the control line -5-  , which is clipped on.