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EVALUATING DISPLAY ZONE 33, DISPLAY ZONES 1 - OXYGEN SENSOR CONTROL LEARNED Possible causes of malfunction if sensor control frequency is too slow: z Slots or holes in sensor body are blocked z Sensor vent hole in area of connecting wire is blocked z Sensor has been overheated (glazed) z Sensor has been damaged by leaded fuel Checking Oxygen Sensor wiring for oxygen sensor 1 z Remove inner plenum chamber cover, left: See PLENUM CHAMBER INNER COVER, REMOVING AND INSTALLING z Connect VAG 1598/31 test box to control module wiring harness. Motronic Engine Control Module z Check Heated Oxygen Sensor (HO2S), see FUEL INJECTION SYSTEM COMPONENTS, CHECKING Appears on Possible cause Corrective action High oxygen z High learned values at idle speed, not so high learned values at part throttle: possible unmetered air in area of intake manifold z Unmetered air between Mass Air Flow (MAF) sensor and throttle valve z Fuel injector blocked z Mass Air Flow (MAF) sensor malfunctioning z Fuel pressure too low z Heated Oxygen Sensor (HO2S) malfunctioning or oxygen sensor soiled z Unmetered air at exhaust manifold gasket z Check intake air system for leaks, see INTAKE AIR SYSTEM (UNMETERED AIR), CHECKING FOR LEAKS z Repair cause z Check quantity injected, see FUEL INJECTORS, CHECKING z Check Mass Air Flow (MAF) sensor, see MASS AIR FLOW (MAF) SENSOR, CHECKING z Check fuel pressure regulator and holding pressure, see FUEL PRESSURE REGULATOR AND HOLDING PRESSURE, CHECKING z Check Heated Oxygen Sensor (HO2S), see FUEL INJECTION SYSTEM COMPONENTS, CHECKING
2003 Volkswagen New Beetle GLS 1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle
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