audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Oxygen Sensor Heaters Before Catalytic Converter, Checking|Page 4231 > < Oxygen Sensor Heaters Before Catalytic Converter, Checking|Page 4229
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To disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131), perform the following steps:

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Remove the screw - arrow - retaining the coolant reservoir.

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

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Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector -  2 -.

Checking primary voltage

Oxygen Sensor Heaters Before Catalytic Converter, Checking|Page 4231 > < Oxygen Sensor Heaters Before Catalytic Converter, Checking|Page 4229