Jetta V6-2.8L (AFP) (1999)
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Replace Heated Oxygen Sensor (HO2S) -G39- before Three Way Catalytic Converter (TWC), item 30. Refer under "Fuel Delivery and Air
Induction/Fuel Injector", See: Fuel Delivery and Air Induction/Service and Repair
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Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
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Display readiness code.
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code
must be generated again.
With Generic Scan Tool
Oxygen Sensor (O2S) And Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), 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 Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
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The oxygen sensor (before catalytic converter) has a static regulation and can be differentiated from the oxygen sensor behind catalytic converter
via a 6-pin connector.
Recommended special tools and equipment
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test 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 like, for example, lights and rear window heating 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.
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.
See: Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor Heater For O2 Sensor Before TWC, Checking
Function test
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Select the output of oxygen sensor signals and check whether the 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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Test oxygen sensor wires.
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