A6 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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Connect multi-meter (resistance measurement) between terminals 1 and 3 of sensor.
Coolant temperature sensor with oval connector:
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Connect multi-meter (resistance measurement) between terminals 3 and 4 of sensor.
All:
Scale A shows resistance values for temperature range 0 - 50 °C and scale B the values for temperature range 50 - 100 °C.
Examples: