Description
BOSCH Fuel Pressure Regulator for 1.4 HDI and 1.6 HDI engines
Used in Citroën, Peugeot, Ford, Mazda, Volvo vehicles
Fully functional with warranty
The Bosch fuel pressure regulator 0928400575 / 1634149180 is a direct-fit component for PSA HDi common-rail engines. Designed for professional workshops and experienced DIY technicians, this regulator maintains stable fuel rail pressure to ensure correct injector operation, smooth idling and reliable throttle response. The unit is frequently sought under its product numbers (0928400575, 1634149180), so listing these codes in search and diagnostic notes increases findability and speeds up repairs.
Technical Information
- Manufacturer: Bosch
- Model: For 1.4 HDI and 1.6 HDI engines
- Product Codes: 0928400575, 1634149180
- Other Numbers: Commonly fitted on PSA HDi fuel systems and referenced by the above OEM/cross codes
- Compatible Vehicles: Citroën (Berlingo, C3, C4, C4 Picasso, Xsara Picasso), Peugeot (307, 407, Partner) and certain Ford, Mazda and Volvo models equipped with PSA HDi engines
Function and Symptoms Of Failure
The fuel pressure regulator controls fuel rail pressure by returning excess fuel to the tank, keeping the injectors supplied at the correct pressure required by the common-rail system. When the regulator malfunctions, common symptoms include rough idle, poor acceleration, loss of power, increased fuel consumption, black smoke, hard starting and engine warning lights (fault codes related to fuel pressure). In some failures, fuel leaks at the regulator or from seals can also occur.
Why This Part Commonly Fails
- Wear And Contamination: Debris, degraded fuel or corrosion can affect the internal valve and diaphragm, impairing pressure control.
- Age And Heat Cycling: Repeated thermal stress and long service life lead to material fatigue and seal deterioration.
- Fuel System Faults: Faulty high-pressure pump or clogged filters can overload the regulator, accelerating failure.
Replacement And Installation
Recommended for competent mechanics or experienced DIYers. Basic replacement steps:
- Relieve fuel system pressure and work in a well-ventilated area away from ignition sources.
- Disconnect the battery and isolate the fuel system.
- Clean the area around the regulator to prevent contamination entering the fuel rail.
- Disconnect electrical connector(s) and fuel return/feed lines (use appropriate fuel line tools and be prepared for some fuel spillage).
- Remove mounting fasteners, replace the regulator and any sealing washers/O-rings with new parts.
- Reassemble, reconnect battery, prime the fuel system and check for leaks. Verify engine operation and clear any related fault codes.
Installation Recommendations
- Always relieve fuel pressure before disconnecting lines and use appropriate personal protective equipment.
- Replace sealing rings and clamps when fitting a new regulator to ensure leak-free joints.
- Inspect fuel filter and high-pressure pump condition when diagnosing regulator faults — secondary issues commonly cause premature regulator wear.
- After installation, verify rail pressure and perform a road test to confirm stable operation across the rev range.
Who Should Fit This Part
Intended for professional garages and experienced home mechanics familiar with high-pressure diesel systems. If you have the correct tools and understand fuel-system safety, this is a straightforward replacement. For less experienced users, professional installation is recommended.
Why Choose This Part
This Bosch regulator offers OEM-level fitment for PSA HDi engines, is commonly available under the listed product numbers for easy identification, and comes fully functional with warranty, providing a reliable option to restore proper fuel pressure control and engine performance.
