Passat Sedan 4Motion W8-4.0L (BDP) (2002)
Oxygen Sensor: Testing and Inspection
Components, Checking
Oxygen Sensor Heater For O2 Sensors Before (TWC), Checking
Components, checking
Oxygen sensor heater for oxygen sensors before Three Way Catalytic Converter (TWC), checking
NOTE: When servicing terminals in harness connector of oxygen sensors, use only gold-plated terminals.
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
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.
Test sequence