volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Oxygen Sensor System - Checking|Page 2113 > < Oxygen Sensor System - Checking|Page 2111
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unplug OXS thermoswitch connectors (arrow)

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check reading displayed on VW 1367

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must be steady 50% +/- 2% (45 +/- 2~ dwell)

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bridge terminals of OXS thermoswitch connectors (arrows)

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check reading displayed on VW 1367

^

must be steady 80% +/- 2% (72 +/- 2~ dwell)

If either reading NOT OK
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check for open circuit in wiring between connector and OXS control unit

If wiring OK
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replace OXS control unit

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remove bridge at connectors

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check continuity of OXS thermoswitch with ohmmeter

^

above 30~C (86~F) = infinite Ohms

^

below 20~C (68~F) = 0 Ohms

If readings NOT OK
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replace thermoswitch

Oxygen Sensor System - Checking|Page 2113 > < Oxygen Sensor System - Checking|Page 2111