Golf GL L4-2.0L (AZG) (2001)
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Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
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Check for open circuits in wire between test box and 6-pin connector according to wiring diagram:
Terminal 4 and test box socket 5
Wire resistance: max: 1.5 Ohms
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Also check wire for short circuit to B+ or Ground (GND).
If wiring is OK:
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Replace Engine Control Module (ECM).
Aging Check
Oxygen Sensor Aging, Oxygen Sensor Before Catalyst, Checking
Special tools and equipment