volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 1659 > < Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 1657
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If oxygen sensor heater is not active:

-

Test oxygen sensor heater after catalytic converter. See: Oxygen Sensor After Catalyst/Heater Check 

If oxygen sensor or oxygen sensor control is not active:

-

Check primary voltage.

NOTE:  Oxygen sensor control is not active for engine code AWM.

If specified value is obtained:

-

Press -C- button.

-

Press buttons -0-, -3- and -6- to select "Display group number 36". Press -Q- button to confirm input.

Indicated on display: (1 to 4 = display fields)

Read measuring value block 36

->

1

2

3

4

-

Check oxygen sensor voltage behind catalytic converter in display field 1: Specification: 0.100 to 0.900 volts (may oscillate slightly)

If indication in display field 1 remains constant on one value:

-

Continue testing according to the following table.

Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 1659 > < Oxygen Sensor (O2S) and Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking|Page 1657