A6 Sedan V6-3.2L (BKH) (2007)
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) terminals 3 to 5 for an open circuit.
Specification: 2.5 to 10 ohms (at room temperature).
If the specification is not obtained:
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Replace the Heated Oxygen Sensor (HO2S) (-G39-) (bank 1, sensor 1) or Heated Oxygen Sensor (HO2S) (-G108-) (bank 2, sensor 1) before
catalytic converter => Fuel Injection and Ignition 24 Removal and Installation
If the specified value is obtained:
Checking voltage supply
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Using a Multimeter , check the electrical harness connector terminals for voltage.
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Operate the starter briefly.
Specified value: battery voltage.
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Switch the ignition off.
If no voltage is present: