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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Connector looseCommon
- Wiring chafedPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Fuel Rail Pressure Sensor
- Sensor Connector
P0194 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.