CP4S2 Fuel Pump 0445010832 – Bosch Compatible for X8Z Diesel Engine | Rsolid Engine Parts
The CP4S2 is an evolution of the Bosch CP4 high‑pressure pump family, offering improved reliability and smoother fuel delivery for modern diesel engines. The 0445010832 fuel pump – fully compatible with Bosch CP4S2 architecture – is the direct OE replacement for engines bearing the X8Z code, a compact common rail diesel found in select passenger cars and light commercial vehicles. This pump restores lost power, eliminates extended cranking, and ensures consistent rail pressure across the entire RPM range. Rsolid engine parts supplies this precision pump with 100% calibration testing and a 12‑month warranty.
1. Structural Advantages of the CP4S2 0445010832 Pump
The CP4S2 represents an upgrade over earlier CP4 pumps, with several design improvements:
Two‑Plunger Radial Design with Enhanced Roller Shoes – Two opposing plungers driven by a polished eccentric cam deliver stable, high‑volume fuel flow. The S2 version features wider roller bearings and improved surface treatment, reducing the risk of scuffing – a known issue on earlier CP4 pumps.
Reinforced Housing with Integrated Damping Chambers – Cast aluminum housing with internal pressure pulsation dampers reduces noise and protects the common rail from pressure spikes.
Optimized Inlet Metering Valve (ZME) – Faster‑responding solenoid valve allows the ECU to control fuel entry more precisely, improving fuel economy and lowering cold‑start emissions.
High‑Pressure Fuel Lubrication – All moving parts are lubricated by diesel fuel, simplifying installation and eliminating external oil lines.
Direct Bosch CP4S2 Compatibility – Identical mounting flange, drive coupler (triangular or splined), high‑pressure outlet, and 2‑pin electrical connector as the original Bosch 0445010832. No modifications or adapters required.
2. Compatible Engine & Vehicle Models (≤5)
The X8Z engine code is believed to be a variant of the PSA DW series or Ford Duratorq family. Common applications include:
Peugeot 508 / 408 2.0 HDi (some markets, engine code X8Z)
Citroën C5 / C6 2.2 HDi (select variants with CP4S2 pump)
Ford Mondeo / Galaxy 2.0 TDCi (late Euro 5 / early Euro 6, pump code 0445010832)
Land Rover Freelander 2 2.2 TD4 (PSA DW12 engine, certain model years)
Peugeot Boxer / Citroën Jumper 2.2 BlueHDi (light commercial, 2015+)
✅ Always confirm your engine code and the Bosch number on your original pump. The 0445010832 is typically stamped on the pump body near the high‑pressure outlet. The X8Z code can be found on the engine block or vehicle VIN plate.
3. Common Failures & Installation/Replacement Advice
Typical Symptoms of a Failing CP4S2 0445010832 Pump:
Extended cranking time, especially after overnight parking.
Loss of power above 2,500 RPM – Rail pressure drops under load, triggering limp mode.
Engine stalling or rough idle – Often with DTC P0087 (fuel rail pressure too low).
Metal particles in the fuel filter – A classic CP4 failure sign. Even small amounts of ferrous debris indicate internal wear.
Unusual whining noise from the pump area – Increases with engine speed.
Fuel leak from the pump body – Particularly around the drive shaft seal or the pressure regulator.
Professional Installation & Replacement Recommendations:
Never install just the pump – If the old pump has failed internally, the entire fuel system is contaminated. Replace the pump, rail pressure control valve, and all injectors, or the new pump will fail within hours. At minimum, perform a full system flush.
Replace all fuel filters – Install new OEM‑quality filter and water separator.
Flush the fuel tank and lines – Remove the tank, drain it, and clean with compressed air and diesel. Replace any rubber hoses.
Inspect and flow‑test injectors – High return flow indicates stuck injectors. Replace or rebuild them before running the new pump.
Prime the low‑pressure circuit – Use a vacuum primer on the return line to pull bubble‑free fuel through the pump and filter. CP4S2 pumps are sensitive to aeration.
Fill the pump with clean diesel – Remove the high‑pressure outlet and pour clean, lubricious diesel into the pump housing to prevent dry start scoring.
Torque connections to spec – High‑pressure outlet M14×1.5 cone seal: 35–40 Nm. Low‑pressure inlet M16×1.5: 25 Nm. Drive shaft nut: consult workshop manual (typically 90–110 Nm).
Reset adaptation values – Use a diagnostic tool (DiagBox for PSA, FORScan for Ford, etc.) to clear learned fuel trims and perform a “high‑pressure pump adaptation” routine.
After installation, run a leak test – Idle the engine for 10 minutes, then inspect all unions and the pump mounting area for wetness.
💡 Pro Tip: CP4 pumps are notoriously sensitive to water and poor quality diesel. Always drain the water separator weekly. Consider installing a fuel additive with lubricity enhancer, especially when using biofuel blends.
4. Why Choose Rsolid Engine Parts?
Exact Bosch CP4S2 Compatibility – Direct replacement for X8Z and other 2.0/2.2 diesel engines using pump 0445010832.
100% Calibration Tested – Each pump is run on a Bosch EPS 200 test bench to verify delivery volume, rail pressure control, and regulator response. Test report available.
12‑Month Warranty – Full coverage against manufacturing defects.
Competitive Pricing – Affordable alternative to dealer‑only pumps.
Fast Worldwide Shipping – Stock ready for export to Europe, Asia, Africa, and the Americas.
Direct Technical Support – Our diesel specialists provide fitment checks, diagnostic assistance, and installation guidance via WhatsApp or email.
Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
