The fuel rail pressure reading does not fit what the computer expects. The driver may notice a hard start, weak power or rough running.
Likely causes, most common first
- Faulty rail pressure sensor
- Low fuel pressure or weak pump
- Damaged wiring or connector
- Clogged fuel filter
Parts usually involved
- Fuel pressure sensor
- Fuel filter
- Fuel pump
- Sensor connector
Test before you replace
Compare the sensor reading with key on engine off and with a mechanical gauge where possible.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.