S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Start the engine and let it run at idle.
The temperature value must increase uniformly in increments of 1.0° C.
If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent.
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Replace the the Engine Coolant Temperature (ECT) Sensor (G62).
Checking internal resistance
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Disconnect the Engine Coolant Temperature (ECT) Sensor (G62) electrical harness connector - 1 -.
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Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor (G62) terminals 1 to 2 for resistance.
Use the chart below for the specified values:
‹› Area A: Resistance values 0 to 50° C.
‹› Area B: Resistance values 50 to 100° C.
Specified values: