Beetle L4-2.0L (AEG) (2000)
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Oxygen Sensor: Testing and Inspection
Oxygen Sensor and O2 Sensor Regulation After TWC, Check
With Generic Scan Tool
Check Oxygen Sensor And Oxygen Sensor Regulation Behind Catalytic Converter
NOTE:
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Vehicle must be raised before connector for oxygen sensor is accessible.
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When servicing terminals 3 and 4 in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Recommended special tools and equipment
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VAG 1526 multimeter or VAG 1715 multimeter
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VAG 1594 connector test kit
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Wiring diagram
Test requirements
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The respective fuses of Heated Oxygen Sensor (HO2S) -G130- 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, for example, 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 measuring values; PID 5, Coolant temperature.
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Oxygen sensor heater for oxygen sensor behind catalytic converter must be OK. See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/Oxygen Sensor, Checking/Oxygen Sensor Behind Catalyst, Checking/Heater Check
Function test
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Select the following output of oxygen sensor signals and check whether the specified values are being reached, Diagnostic mode 5: Check output
of oxygen sensor signals.
If specified values are obtained:
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End diagnosis and switch ignition off.
If specified values are not obtained:
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End diagnosis and let engine continue to run at idle.
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Check primary voltage.
Checking primary voltage
