Fuel Rail Pressure Sensor
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of HYUNDAI MOTOR AMERICA
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Fuel rail pressure sensor is mounted to fuel rail and it senses fuel rail pressure.
GDI ECM operates fuel pressure control valve with the signal from fuel rail pressure sensor to control optimized RPM and rail pressure.