Sensor, Fuel Pressure: Description
WARNING: This page is about a different car, the 2018 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of CHRYSLER GROUP, LLC
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The fuel rail pressure sensor is a serviceable item and is screws into the right fuel rail at the back of the engine. The Powertrain Control Module (PCM) uses this sensor to monitor the fuel rail pressure.