P0192
Fuel Rail Pressure Sensor Circuit Low
- Severity
- High
- Driving
- Drive only to a garage
The fuel rail pressure signal is too low - outside the range the sensor is built to produce, which points at the circuit rather than at the fuel pressure itself. A lost 5 volt supply or earth drives the signal hard to one end, and that is a wiring fault rather than a failed sensor.
Possible causes
- CommonFailed fuel rail pressure sensor
- CommonCorroded or damaged connector at the sensor
- CommonWiring fault between the sensor and the module
- CommonGenuine fuel supply problem - blocked filter, weak pump, air in the system - that the sensor is correctly reporting
- PossibleFuel pressure regulator or metering valve fault
- PossibleWorn high pressure pump
What you might notice
- Hard starting, or refusing to start at all
- Loss of power, or dropping into limp mode
- Rough running, misfiring, or cutting out
- Smoke from the exhaust
- Check engine light on
What to check, in order
- Read all codes before deciding this is the sensor. Fuel delivery and pressure regulation codes stored alongside usually mean the sensor is telling the truth about a supply problem, and replacing it would fix nothing.
- Compare commanded rail pressure against actual on live data, at idle and under load. A system that holds pressure at idle and loses it under load is worn rather than broken.
- Check the low pressure supply and the filter first. Most rail pressure faults start upstream, and the filter is the cheapest thing in the chain.
- Inspect the sensor connector for corrosion and for damaged pins.
- Check the sensor's supply and earth at the connector before replacing anything. This is a five minute test that regularly saves an expensive part.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel and air metering
P0100P0101P0102P0103P0104P0105P0106P0107P0108P0109P0110P0111P0112P0113P0114P0115P0116P0117P0118P0119P0120P0121P0122P0123P0124P0125P0126P0127P0128P0129P0130P0131P0132P0133P0134P0135P0136P0137P0138P0139P0140P0141P0142P0143P0144P0145P0146P0147P0148P0149P0150P0151P0152P0153P0154P0155P0156P0157P0158P0159P0160P0161P0162P0163P0164P0165P0166P0167P0168P0169P0170P0171P0172P0173P0174P0175P0176P0177P0178P0179P0180P0181P0182P0183P0184P0185P0186P0187P0188P0189P0190P0191P0192P0193P0194P0195P0196P0197P0198P0199