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Originally Posted by nycplumber
Yes that is exactly what they're referring to. On older bmws you would hear an audible click. And on other cars you can test with a multi meter. I am just not sure of the exact procedure for this one. On our cars there is 2, one for each bank and while they're not expensive I don't like just throwing parts at things. Harrop is surprisingly not good at diagnosising issues with their systems.
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If the issue was the sensor the car would very likely throw a code. That’s what makes me think it’s the signal from the sensor not getting to the Harrop. Have you inspected the wiring splices in the car’s ecu box that provide the data to the Harrop mini-ecu?