Disconnect the sensor wire from the ECU and probe it directly when the car is hot. You should get a high voltage reading regardless (between 0.7v-0.9v). If not, the sensor might be bad.

Do you still have the old sensor?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k