Volkswagen Passat 1995 Official Factory Repair Manual page 2141

Function tests
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Function tests
Oxygen sensor and oxygen sensor
regulation before catalytic converter,
checking
Recommended special tools and equipment
V.A.G 1526 multimeter or V.A.G1715
multimeter
V.A.G 1594 connector test kit
Wiring diagram
Requirements
The respective fuses of Heated Oxygen Sensor
(HO2S) -G39- must be OK:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
Battery voltage must be at least 11.5 Volts.
Ground (GND) connections between engine and
chassis must be OK.
All electrical consumers such as, lights and rear
window defroster must be switched off.
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12/6/2004