P0194 — Fuel Rail Pressure Sensor Circuit Intermittent
The ECU detects intermittent signal dropouts on the fuel rail pressure sensor. Loose connector, chafed wiring or sensor failing under vibration/heat.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Fuel rail pressure sensor
- Sensor connector
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Connector loose
- Wiring chafed
- Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.