A4 Sedan V6-3.2L (BKH) (2007)
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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) Heater (Z30 ) electrical harness connector - 1 -.
Checking internal resistance
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Using a multimeter, check the Oxygen Sensor (O2S) Heater terminals 1 to 2 for resistance.
Specified value: 1.0 to 20.0 ohms (at approx. 20° C)