P0191

Part 1:

Part 2:

P0191
The scan tool indicates Diagnostic Trouble Code (DTC) P0191: A range/performance problem in the fuel pressure circuit.

The fuel pressure sensor is located on the fuel pressure regulator and it detects fuel injector pressure. This signal is used to correct the fuel injection period by monitoring the fuel injector pressure. It also detects any abnormality in the fuel pressure.