Golf L4-2.0L (BEV) (2004)
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 fuses 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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For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
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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, Diagnostic mode 1: Check measured values; PID 5, Coolant temperature. See: 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.
Work sequence (vehicles with engine code AEG)
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Select output of oxygen sensor signals and check whether specified values are being reached, Diagnostic mode 5: Check output of oxygen sensor
signals. See: Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/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.
Checking primary voltage