Volkswagen Passat 1995 Official Factory Repair Manual page 2147

Function tests
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.24.3
Requirements
The respective fuses of Heated Oxygen Sensor
(HO2S) -G108- 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.
Parking brake must be engaged or else daylight
driving lights will be switched on.
For vehicles with automatic transmission,
selector lever must be in -P-.
If vehicle is equipped with an A/C system, it must
be switched off.
Exhaust system must be properly sealed
between catalytic converter and cylinder head.
Coolant temperature must be at least 80 C
Page ST-14 , Diagnostic mode 1: Check
measured values; PID 5, Coolant temperature.
Oxygen sensor heater for oxygen sensor behind
catalytic converter must be OK, check
24-30 .
Page 7 of 10
24-92
Page
12/6/2004