Turbocharger Speed Sensor
WARNING: This page is about a different car, the 2018 Infiniti Q60. However, it is still accessible from the selected car via links, so may be relevant.
The turbocharger speed sensor is installed to the compressor side of turbocharger and detects revolutions of turbocharger with the compressor wheel blade of turbocharger.
 Courtesy of NISSAN NORTH AMERICA, INC.
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The use of eddy current sensor enables the detection of revolutions of turbocharger at high speed rotation.