A4 Quattro Cabriolet V6-3.2L (BKH) (2007)
Oxygen Sensor: Testing and Inspection
Oxygen Sensor Heater After Catalytic Converter, Checking
Oxygen Sensor Heater after Catalytic Converter, Checking
This procedure is used to check Oxygen Sensor (O2S) Heater (Z29) or Oxygen Sensor (O2S) Heater ( Z30).
‹› When servicing terminals in harness connector of Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC) Heater, use only
gold-plated terminals.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) fuse OK.
‹› The Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) fuse OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Testing and Inspection/Initial Inspection
and Diagnostic Overview/General Diagnosis.
Start diagnosis
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Disconnect the Oxygen Sensor (O2S) Heater (Z29 ) electrical harness connector - 2 -.
To disconnect the Oxygen Sensor (O2S) Heater (Z30), perform the following steps:
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Remove the screw - arrow - retaining the coolant reservoir.