A4 Quattro Cabriolet 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 (-Z28- ) electrical harness connector - 2 -.
Checking internal resistance
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Using a multimeter, check the Heated Oxygen Sensor (HO2S) terminals 3 to 5 for resistance.
Specified value: 2.5 to 10.0 ohms (at approx. 20° C)