volkswagen Workshop Repair Guides

Volkswagen Workshop Manuals

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Page 7
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Check wiring for open circuit between Test Box and 4-pin harness connector to ECM using Wiring diagram.
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Terminal 3 + socket 51

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Terminal 4 + socket 52
Wire resistance: maximum: 1.5 Ohms

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Also check wiring at 4-pin harness connector for shorting to one another.

Terminal 4 + socket 51 specification: Infinity Ohms

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Check shield for short to sensor wiring using wiring diagram.
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Terminal 4 + socket 14

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Terminal 3 + socket 14
Specification: Infinity Ohms

If wiring OK:

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Replace Engine Control Module.

Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > Oxygen Sensor Aging, Check > Page 3089

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