volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Heated Oxygen Sensor (HO2S) -G39- Before Converter, Checking|Page 3704 > < Heated Oxygen Sensor (HO2S) -G39- Before Converter, Checking|Page 3702
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Check probe heating for continuity at Oxygen sensor connector contacts 1 and 2.

If it is determined that probe heating has an open circuit:

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Replace Oxygen Sensor (O2S) behind three way catalytic converter (TWC) -G130-.

If probe heating has continuity:

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Set multimeter to measure voltage and connect to contacts 1 and 2 on connector to control module.

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Start engine and run at idle speed.

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Measure voltage supply. When display group 41, display zone 4 displays:
Display, Htg.aC.ON:
Specification: 11.0 to 14.5 V
Display, Htg. aC.ON/Htg.aC.OFF (alternating)
Specification: Between 0.0 to 12.0 V fluctuating switch ignition off.

If no voltage is present:

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Connect test box VAG 1598/22 to control module wiring harness.

Heated Oxygen Sensor (HO2S) -G39- Before Converter, Checking|Page 3704 > < Heated Oxygen Sensor (HO2S) -G39- Before Converter, Checking|Page 3702