Common-rail diesel injection and direct-injection petrol systems operate at pressures that would have seemed extraordinary in earlier engine generations โ modern common rail runs between 1,500 and 2,000 bar โ and the fuel pressure sensor is what allows the ECU to maintain such precise control over injection timing and quantity. Mounted in the high-pressure fuel rail or on the pump outlet, it measures actual rail pressure in real time and feeds that data back to the injection control unit. When the sensor signal drifts or fails, the ECU either compensates incorrectly โ producing black smoke, rough running, and hard starting โ or defaults to a safety map that reduces power dramatically. On some calibrations the engine will not start at all without a valid pressure signal. Because the thread form, electrical connector, pressure range, and signal protocol vary between injection system generations and manufacturers, the OE number is the only correct basis for selection. Bosch supplies the majority of high-pressure fuel system sensors as original equipment across Mercedes-Benz, Audi, and Volkswagen applications; MEAT & DORIA and HOFFER cover a wide range of French and Asian platforms. Unlike many sensor categories, pressure range mismatches are immediately obvious rather than gradual, making correct OE matching particularly important.
The fuel pressure sensor OE number is tied to the injection system generation (Bosch CP1, CP3, CP4 etc. for common rail diesels, or the specific direct-injection system on petrol engines), the thread form, and the connector type. Use the make, model, and engine code selectors on this page to filter TecDoc-confirmed OE references for your vehicle. A pressure sensor with the wrong range โ even if it physically fits โ will produce incorrect readings that the ECU cannot distinguish from a real pressure fault, causing hard starting or reduced power immediately.
OEM fuel pressure sensors used in high-pressure injection systems are produced to stringent calibration standards โ typically by Bosch for most European common rail applications. Quality aftermarket sensors from MEAT & DORIA or HOFFER are manufactured to the same pressure range and signal output specifications. Generic or uncalibrated sensors without an OE cross-reference are higher-risk in this application than in most others, because even a small calibration error at 2,000 bar rail pressure translates directly to combustion issues and potential injector damage over time.
Indirectly, yes. If the sensor reports a lower rail pressure than actual, the ECU commands the high-pressure pump to increase output, running the system at above-design pressure. Sustained over-pressure accelerates wear on injector needle seats and high-pressure pump components. Conversely, if the sensor reads high, the ECU reduces pump output and the injectors operate under insufficient pressure, causing poor atomisation, incomplete combustion, and particulate accumulation in the DPF. Either mode of failure should be diagnosed and resolved quickly.
Hard starting โ particularly from cold โ combined with an engine management warning light is the most frequent presentation, as the ECU detects an implausible pressure signal during cranking. Once running, symptoms include rough idle, reduced power, black smoke on diesel engines indicating over-fuelling, and occasionally a sudden power loss or limp-home activation. On petrol direct-injection engines, misfires under load and an increased fuel consumption figure are also characteristic. A stored diagnostic trouble code pointing to the fuel rail pressure circuit confirms the sensor as the primary suspect.
Showing 100 of 1,338 Fuel pressure sensor OE numbers. Enter the OE on the main OE search to jump to any reference.
