Volkswagen Passat 1995 Official Factory Repair Manual page 2268

Diagnostic function, selecting
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.ST.2
Diagnostic mode 5: Check output of
oxygen sensor signals
Note:
This diagnostic mode can only be selected with
Module number 10 - Engine Electronics.
Function
The static values of the oxygen sensors are
indicated via this diagnostic mode.
The values of the individual oxygen sensor test
results must reach the specified value or must be
within the min.- and max.- limits.
Requirements
Exhaust system must be properly sealed
between catalytic converter and cylinder
head.
There must not be any DTCs stored in DTC
memory Page ST-21
Check DTC memory.
Coolant temperature must be at least 80 C
Page ST-14 , Diagnostic mode 1: Check
measured values; PID 05, Coolant
temperature.
Page 15 of 34
ST-27
, Diagnostic mode 3:
12/6/2004