P0190Fuel Rail Pressure Sensor A Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The rail pressure sensor A measures the pressure in the high-pressure fuel rail of common-rail diesels and petrol direct-injection engines – a three-wire sensor with 5 V reference. P0190 is the general circuit code used when a manufacturer does not split low and high; GM and Ford use P0192/P0193 instead. Bosch EDC16 diesels (Saab/Opel 1.9) report P0190 with a fault type byte, and a Saab bulletin traces it to corrosion in the sensor connector, sometimes with no restart for up to 15 minutes. On a sensor fault the engine runs on a calculated pressure in limp mode – on Saab's 3.0 V6 diesel with at most 40 MPa rail pressure and 20 % pedal.
- What you may notice
- Check engine light on
- Limp mode, loss of power
- Stalling or no start (sometimes only after a waiting time)
- Rough idle
- Likely causes
- LikelyConnector corroded or water ingress at the rail pressure sensor
- PossibleRail pressure sensor faulty
- PossibleHarness damaged (heat, chafing)
- Rare5 V reference disturbed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.