S4 Quattro Cabriolet V8-4.2L (BHF) (2008)
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Disconnect the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector - 2 -.
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Using a multimeter , check the Engine Coolant Temperature (ECT) Sensor G62 terminals 3 to 4 for resistance.
Use the chart below for the specified values:
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Area A: Resistance values 0 to 50 degrees C.
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Area B: Resistance values 50 to 100 degrees C.
Specified values:
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Range A, 30 degrees C equals a resistance of 1.5 to 2.0 kOhms
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Range B, 80 degrees C equals a resistance of 275 to 375 Ohms
If any of the specified values was not obtained:
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Replace the Engine Coolant Temperature (ECT) Sensor G62.
Testing if display is approx. -40.0 degrees C: