Volkswagen Passat 1995 Official Factory Repair Manual page 1680

Motronic Fuel Injection and Ignition system, component layout
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW...
Page 17 of 59
24-11
14 - Harness
connector
4 pin
For
Heated
Oxygen
sensor
and
Oxygen
sensor
heater
Mounted
to right-
hand rear
engine
mounting,
in
direction
of travel
With
ignition
switched
on check
Oxygen
sensor
basic
Voltage
between
terminals
3 and 4,
must be
approx.
0.5 Volts
Check
Oxygen
sensor
heater
Voltage
supply
Page 01-
42 ,
Electrical
checks,
6/12/2004