Vehicles with engine code BDF

NOTE: Do not use pressurized air for the following test!

Remove engine cover.
Remove intake air hose between Mass Air Flow (MAF) sensor and throttle valve control module. See item 16 in AIR FILTER, DISASSEMBLING AND ASSEMBLING (VEHICLES WITH ENGINE CODE BDF) .

Disconnect vacuum hose from Secondary Air Injection (AIR) Solenoid Valve -N112- at combination valve (arrow).

Fig 1: Disconnecting Vacuum Hose From Secondary Air Injection Solenoid Valve At Combination Valve (Engine Code BDF)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Connect hand vacuum pump (V.A.G 1390) to vacuum connection of combination valve (arrow).

Fig 2: Connecting Hand Vacuum Pump To Vacuum Connection Of Combination Valve (Engine Code BDF)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Disconnect pressure hose to combination valve at coupling (arrow) and blow into it with light pressure.
Combination valve must close.

Fig 3: Disconnecting Pressure Hose To Combination Valve At Coupling (Engine Code BDF)

Courtesy of VOLKSWAGEN OF AMERICA, INC.

NOTE: To disengage, compress the buttons at the hose coupling.

If the combination valve does not open or it is constantly open: