Checking Air and Vacuum Hoses

The following points should be carefully checked if leakage is suspected. Both the hoses and hose connections must be checked.
- The upper charge-air pipe
- The Turbocharger (TC) control valve and the Boost Pressure Control (BPC) valve
- The brake servo
- The crankcase ventilation
- The Mass Air Flow Engine (MAP) sensor
- The air intake hose
- The Turbocharger (TC) control valve
- The Throttle Body (TB)
- The lower charge-air pipe
- The Idle Air Control (IAC) valve
- The EVAP charcoal filter
- The Canister Purge (CP) valve
- The vacuum connections on the intake manifold
- The Charge Air Cooler (CAC)
- The intake manifold and the gasket
- The crankcase ventilation and the oil trap
- The fuel pressure regulator
- The injectors and seals
- The exhaust system.
The following points should be carefully checked if leakage is suspected. Both the hoses and hose connections must be checked.
- The pressure regulator for the Idle Air Control (IAC) valve
- The Charge Air Cooler (CAC)
- The Turbocharger (TC) control valve
- The EVAP system
- The crankcase ventilation.