audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Heated Oxygen Sensor after Catalytic Converter, Checking|Page 7672 > < Heated Oxygen Sensor after Catalytic Converter, Checking|Page 7670
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(bank 1, sensor 2).

To test the Oxygen Sensor (O2S) Heater (-Z30-) (bank 2, sensor 2), perform the following steps:

-

Remove the screw - arrow - retaining the coolant reservoir.

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Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch (F66) at the bottom of the coolant reservoir and set aside
the coolant reservoir with the coolant hoses -  1 - and - 2 - connected.

-

Disconnect the 4-pin electrical harness connector - 2 - from the Heated Oxygen Sensor (HO2S) (-G131-) and Oxygen Sensor (O2S) Heater (-Z30-)
(bank 2, sensor 2).

Checking internal resistance

‹› Terminals - 2 - and - 3 - Are not called out in the graphic.

Heated Oxygen Sensor after Catalytic Converter, Checking|Page 7672 > < Heated Oxygen Sensor after Catalytic Converter, Checking|Page 7670