A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor Before Catalytic Converter
Heated Oxygen Sensor before Catalytic Converter
Removing
Special tools, testers and auxiliary items required
‹› Ring Spanner 7-piece Set (3337)
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Disconnect electrical harness connector - 1 - of the Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor (O2S) Heater (Z19).
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Remove Heated Oxygen Sensor (HO2S) (G39) - 2 - using a tool from the Ring Spanner 7-piece Set (3337).
Installing
When installing, note the following:
‹› New oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body.
‹› For a used oxygen sensor, only coat threads with hot bolt paste. This paste must not come into contact with sensor slots.
‹› Wiring connection of oxygen sensor must always be secured in the same position when installing so that contact with the exhaust pipe is avoided.
‹› Tightening specifications: 55 Nm.