Volkswagen Golf 1999 Service Manual page 883

Functions, checking
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Oxygen Sensor (O2S) and Oxygen
Sensor control after Three Way Catalytic
Converter (TWC), checking
Note:
The vehicle must be raised to gain access to
the Oxygen Sensor (O2S) connector.
Only gold plated terminals may be used to
service the terminals in the Oxygen Sensor
(O2S) connectors.
Special tools, materials and equipment
VAG 1551 Scan tool (or VAG 1552) with VAG
1551/3 adapter cable
Note:
All functions which could previously be performed
with VAG 1551/1552 can also be performed with
the VAS 5051.
VAG 1526 or Fluke 83 Hand multimeter or VAG
1715 multimeter
VAG 1594 Adapter set
VAG 1598/31 test box
Electrical Wiring Diagrams
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12/2/2005