Volkswagen Passat 1995 Official Factory Repair Manual page 1873

Multiport fuel injection and ignition system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.24.1
Checking HO2S wiring
- Connect VAG 1598/18 test box to ECM wiring
harness (arrow).
- Disconnect 4-pin connector -1- (black) to HO2S -
G39- (before three way catalytic converter).
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12/6/2004