audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Understanding Track Style Wiring Diagrams, Important Stuff !|Page 666 > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 664
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Oxygen Sensor: Testing and Inspection

TEST CONDITIONS

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engine oil temperature min. 80°C (176°F) 

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radiator fan must have come on at least once

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all electrical consumers switched OFF (radiator fan and A/C must not be running while adjusting)

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pressure gauge not connected

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exhaust system must be free of leaks

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oxygen sensor control function OK

WORK SEQUENCE

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unplug harness connector from differential pressure regulator

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attach hamess adapter VW 1315/A1 between open harness connector and differential pressure regulator

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attach US 1119 to harness adapter VW 1315/A1

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switch US 1119 to DCA 200

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start engine and run at idle for minimum of two minutes

NOTE:  After approx. two minutes, exhaust gas warms up oxygen sensor.

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read differential pressure regulator current displayed on US 1119

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current reading must fluctuate

If NO

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check current reading at 3,000 RPM 

If still NOT OK

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replace oxygen sensor

Understanding Track Style Wiring Diagrams, Important Stuff !|Page 666 > < Understanding Track Style Wiring Diagrams, Important Stuff !|Page 664