What is MID 123:
MID 123 refers to an issue with the Fuel Rail Pressure Sensor. The ECM detects an abnormal signal from the fuel rail pressure sensor, which may lead to incorrect fuel pressure readings and affect engine performance, potentially causing stalling or poor acceleration.
Why This Happens:
- Faulty fuel rail pressure sensor.
- Shorted or damaged wiring in the sensor circuit.
- Loose or corroded sensor connectors.
- Low fuel pressure due to a malfunctioning fuel pump.
- ECM misinterpreting the sensor’s signal.
How to Fix It:
- Inspect the fuel rail pressure sensor for damage or malfunction.
- Test the sensor’s voltage and resistance to ensure it is within specification.
- Check wiring and connectors for visible damage, corrosion, or loose connections.
- Replace the faulty sensor if necessary.
- Inspect the fuel system for low fuel pressure or a malfunctioning fuel pump.
How to Avoid It Before It Happens:
- Regularly inspect the fuel rail pressure sensor and wiring.
- Perform routine fuel system maintenance.
- Keep connectors clean and corrosion-free.
- Perform diagnostic checks to monitor fuel system health.
- Clue’s Fuel Management services monitor fuel pressure to prevent issues before they affect engine operation.
