New Beetle L4-2.0L (AZG) (2003)
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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 before catalytic converter must be OK. See: Testing and Inspection/Component Tests and General
Diagnostics/Oxygen Sensor, Checking
Function test (Vehicles with engine code AEG)
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Select the lambda test results and check whether the specified values are being reached, 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
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Unscrew protective cover (arrows) and disconnect 4-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.
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Connect multimeter to terminals 3 + 4 of connector to Engine Control Module (ECM) for voltage measurement.
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Switch on ignition and measure primary voltage.
Specified value: 0.400 to 0.500 Volts
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Switch ignition off.
If specified value is not obtained:
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Test oxygen sensor wires.
If specified value is obtained:
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Replace Heated Oxygen Sensor (HO2S) 1 Bank 1 -G39- before catalytic converter, item 9.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
Checking oxygen sensor wires
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Connect test box to control module wiring harness, connect test box for wiring test. See: Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring Test