Passat Sedan 4Motion W8-4.0L (BDP) (2002)
Oxygen Sensor: Testing and Inspection
Functions, Checking
Oxygen Sensors and O2 Sensor Regulation Before (TWC), Check
Functions, checking
Check oxygen sensors and oxygen sensor regulation before catalytic converter
NOTE:
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When servicing terminals in harness connector of oxygen sensors, use only gold-plated terminals.
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The oxygen sensors before catalytic converter have a constant regulation and can be differentiated from the oxygen sensor behind catalytic
converter via a 6-pin connector.
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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
The respective fuses of Heated Oxygen Sensor (HO2S) -G39- and Heated Oxygen Sensor (HO2S) 2 -G108- must be OK.
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Fuses -1, 2, 3, 4 and 7- in protective housing (plenum chamber, left) 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 module 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. Refer to "Scan
Tool Testing/Diagnostic Mode 1: Check Measuring Values".
See: Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Mode 1: Check Measuring Values
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Oxygen sensor heaters for oxygen sensors before catalytic converter must be OK, check
See: Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensors and O2 Sensor Regulation Before (TWC), Check