Engine code ALH

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Fig 1: Identifying Vacuum Hose Connections Diagram (ALH)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - EGR Vacuum Regulator Solenoid Valve

2 - EGR Vacuum Regulator Solenoid Valve N18

3 - Non-return valve

4 - From brake booster

5 - Air filter housing

6 - Vacuum pump