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If the specification is obtained: z Press --> button. z Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button. z Switch off ignition. Continuation If the oxygen sensor control in display zone 1 does not fluctuate as stated: z Press --> button. z Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button. z Test drive vehicle to remove possible residue on oxygen sensor and repeat check. Observe the valid safety precautions when carrying out a road test, see SAFETY PRECAUTIONS . If the specifications in display zone 1 are not obtained even after a test drive, or the value does not z Check oxygen sensor before Three Way Catalytic Converter (TWC) for aging, see OXYGEN SENSOR Evaluating display zone 33, display zones 1 - oxygen sensor control learned values before Three Way EVALUATING DISPLAY ZONE 33, DISPLAY ZONES 1 - OXYGEN SENSOR CONTROL LEARNED Appears on Possible cause Corrective action Low oxygen z Low learned values at idling but with normal learned values at part throttle: possible oil dilution (high level of fuel in oil) z Fuel injector leaking z Fuel pressure too high z EVAP solenoid valve 1 permanently open z Mass Air Flow (MAF) sensor malfunctioning z Heated Oxygen Sensor (HO2S) malfunctioning or oxygen sensor soiled z Check if it disappears after highway drive or oil change z Check fuel injector, see FUEL INJECTORS, CHECKING z Check fuel pressure regulator and holding pressure, see FUEL PRESSURE REGULATOR AND HOLDING PRESSURE, CHECKING z Check EVAP solenoid valve 1, see OUTPUT DIAGNOSTIC TEST MODE (DTM) z Check Mass Air Flow (MAF) sensor, see MASS AIR FLOW (MAF) SENSOR, CHECKING
2003 Volkswagen New Beetle GLS 1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle
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