New Beetle L4-2.0L (AVH) (2005)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor and Oxygen Sensor Control Before Catalytic Converter, Checking
Oxygen Sensor And Oxygen Sensor Control Before Catalytic Converter, Checking
NOTE:
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Vehicle must be raised before connector for oxygen sensor is accessible.
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When servicing terminals in harness connector of oxygen sensor, use only gold-plated terminals.
Recommended special tools and equipment
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V.A.G 1526 multimeter or V.A.G 1715 multimeter
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V.A.G 1594 connector test kit
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Wiring diagram
Requirements
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The respective fuse of Heated Oxygen Sensor (HO2S) -G39- must be OK.
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Battery voltage must be at least 11.5 volts.
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All electrical consumers such as, lights and rear window defroster must be switched off.
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Parking brake must be engaged or else daylight driving lights will be switched on.
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If vehicle is equipped with an A/C system, it must be switched off.
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Ground (GND) connections between engine and chassis must be OK.
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Exhaust system must be properly sealed between catalytic converter and cylinder head.
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Coolant temperature must be at least 80 degrees C => page ST-18. Diagnostic mode 1: Check measured values; PID 5, Coolant temperature. See:
Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 1: Check
Measured Values
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Oxygen sensor heater for oxygen sensor before catalytic converter must be OK, check => page 24-64.
Function test (Vehicles with engine code AEG)
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Select output of oxygen sensor signals and check whether specified values are being reached => page ST-31. Diagnostic mode 5: Check output of
oxygen sensor signals.
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End diagnosis and switch ignition off.
If specified values are not obtained:
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Check primary voltage => page 24-177.
Checking primary voltage