What is SPN 171
- SPN 171: Refers to a fault related to the fuel pressure sensor, indicating that the pressure within the fuel system is out of range. It’s a critical sensor that monitors fuel flow and ensures the engine is receiving the correct fuel pressure.
When SPN 171 is triggered, it signals that the ECM is not receiving the proper fuel pressure data, which could lead to poor engine performance, fuel efficiency issues, or even engine damage.
Why It Happened
This fault can occur due to:
- A faulty fuel pressure sensor that is not providing accurate readings.
- Incorrect fuel pressure caused by a malfunctioning fuel pump or regulator.
- Wiring issues such as short circuits, corrosion, or loose connections between the sensor and ECM.
- Clogged fuel filters or blockages in the fuel system, preventing normal pressure levels.
- A failed ECM that cannot properly process the sensor data.
How to Resolve It
To resolve SPN 171:
- Inspect the fuel pressure sensor for any faults and replace if necessary.
- Check the wiring and connections for damage or corrosion.
- Test the fuel system, including the pump and pressure regulator, to ensure they are functioning correctly.
- Check fuel quality and ensure there is no contamination in the system.
- Clear the fault code after repairs and restart the engine to confirm the issue is resolved.
How to Avoid Before It Happens
To prevent SPN 171:
- Inspect the fuel system regularly, checking fuel pressure, filters, and sensors.
- Perform routine fuel filter changes to prevent blockages and ensure smooth fuel flow.
- Use Clue to monitor fuel pressure data and get early alerts for abnormal pressure readings.
- Conduct timely inspections to identify minor issues before they develop into bigger problems.
