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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.0L - DTCS P0480-00 To P0687-00 >> DTC Troubleshooting >> P04DB-Crankcase Ventilation System Disconnection >> Possible Causes

Possible Causes

Possible Causes
5-VOLT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
INCORRECT OIL LEVEL - TOO HIGH
CRANKCASE VENTILATION HOSE DISCONNECTED OR LEAKING
CRANKCASE VENTILATION HOSE
CRANKCASE PRESSURE SENSOR

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .