Volkswagen Passat 1995 Official Factory Repair Manual page 1340

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.G1526 Multimeter or V.A.G1715
multimeter
V.A.G1594 Connector test kit
Wiring diagram
Test 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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