Common Rail Fuel Pump 0445010533 – Bosch CP4S1 Compatible for Volkswagen Group 2.0 TDI Engines (Engine Code CLC) | Rsolid Engine Parts
The Bosch CP4S1 0445010533 common rail fuel pump is a critical high-pressure component for a range of 2.0‑litre TDI engines from the Volkswagen Group. This pump is fully compatible with Bosch‘s CP4S1 pump family and serves as a direct replacement for engines bearing the code CLC, which is widely used across multiple VW, Audi, Seat and Skoda models.
From the Golf VI to the Passat B7, the Tiguan and the A4 B8, the 0445010533 delivers the precise, high-pressure fuel required for efficient combustion, reliable cold-start performance and long-term durability. Rsolid Engine Parts supplies this pump as a brand‑new, Bosch‑compatible unit — 100% calibration tested, and backed by a full 12‑month warranty at competitive pricing.
1. Structural Advantages of the Bosch CP4S1 0445010533 Pump
The 0445010533 belongs to the Bosch CP4S1 series, which is a further development of the well‑known CP4 common rail platform. It offers a number of engineering benefits that make it particularly suitable for high‑efficiency 2.0 TDI engines:
CP4S1 Two‑Plunger Radial Design – Two opposing plungers arranged radially around a precision‑ground eccentric cam deliver stable, high‑volume fuel flow with minimal pressure ripple. This results in lower stress on the common rail and the injectors, promoting a longer service life.
Integrated Vane‑Type Transfer Pump – A built‑in low‑pressure vane pump draws fuel directly from the tank and feeds it to the high‑pressure plungers, eliminating the need for an external lift pump and simplifying installation.
High‑Pressure Capability (1,800 bar) – The CP4S1 is engineered to operate at rail pressures up to 1,800 bar (26,100 psi), ensuring excellent fuel atomisation, cleaner combustion, and reduced fuel consumption across the entire engine speed range.
High‑Pressure Fuel Lubrication – All internal moving parts (plungers, roller shoes, eccentric cam) are lubricated solely by diesel fuel, removing the need for external oil lines and guaranteeing consistent lubrication even under high load.
Integrated Digital Flow Control Valve (ZME) – An inlet metering solenoid valve precisely regulates the fuel volume that enters the high‑pressure section, in accordance with ECU demand. This provides accurate rail pressure control, improved throttle response and lower fuel consumption.
Robust Cast Housing with Anti‑Corrosion Coating – The pump housing is made from high‑strength materials with a protective surface treatment, designed to withstand the vibration, temperature cycling and environmental exposure typical of everyday driving.
Direct Bosch CP4S1 Compatibility – Identical mounting flange (SAE standard), drive gear interface, high‑pressure outlet ports and electrical connector as the original Bosch 0445010533. True plug‑and‑play replacement without modifications.
2. Compatible Vehicle Models (≤5)
The 0445010533 pump is calibrated for 2.0 TDI common rail engines (engine code CLC) and for related engine codes such as CFFB, CFGB, CFHC, CJCB, CNFA and CNFB. Typical applications include:
Volkswagen Golf VI (5K1) 2.0 TDI (2009–2012)
Volkswagen Passat B6/B7 2.0 TDI (2009–2014)
Volkswagen Tiguan (5N) 2.0 TDI (2009–2015)
Audi A3 (8P) 2.0 TDI (2009–2012)
Audi A4 (B8) 2.0 TDI (2009–2015)
Volkswagen Caddy 2.0 TDI and Audi Q5 2.0 TDI are also covered by the same CP4 pump family.
The pump is also compatible with a wide range of Skoda (Octavia, Superb, Yeti) and Seat (Leon, Ibiza, Altea) models that share the same CP4S1 fuel system.
✅ Important fitment note – The Volkswagen part number 03L130755AB directly corresponds to Bosch number 0445010533. Cross‑reference numbers also include 0445010565, 0445010551, 0986437405 and 03L130755AA. Before ordering, always verify the Bosch number on your original pump (stamped on the pump nameplate) and check your engine code (CLC, CFFB, CFGB, CFHC, etc.).
3. Common Failures & Installation/Replacement Advice
3.1 Typical Symptoms of a Failing 0445010533 Pump
Extended cranking time before start – The engine struggles to start, especially after being parked overnight. This is often due to insufficient rail pressure build‑up.
Loss of power under acceleration or load – The vehicle feels sluggish when overtaking, climbing hills, or when towing, frequently accompanied by black exhaust smoke.
DTC codes P0087, P0088, or P0191 – “Fuel Rail Pressure Too Low”, “Too High”, or “Fuel Pressure Sensor Rationality”. These are classic indications of pump malfunction.
Unusual noise from the pump area – A whining, grinding or metallic clicking sound that changes with engine RPM, suggesting bearing or cam wear.
Metal particles in the fuel filter – A clear sign of CP4 internal wear (plunger scuffing or roller bearing failure). Even tiny ferromagnetic particles indicate imminent pump failure.
External fuel leakage – Visible diesel wetness around the pump body, particularly at the drive shaft seal or around the metering valve mounting area.
3.2 Professional Installation & Replacement Recommendations
Perform a complete fuel system diagnosis – Before replacing the pump, use a diagnostic tool (VCDS, Bosch KTS, or a generic scanner with live data) to verify rail pressure values, injector return flow rates, and identify any related faults.
Replace all fuel filters – Install new OEM‑quality fuel filters (including the water separator) before running the new pump. The CP4S1 is highly sensitive to contamination.
Flush the entire fuel system – Drain and clean the fuel tank. Blow out all supply and return lines with compressed air. Replace any rubber hoses that show signs of degradation. This step is non‑negotiable; debris from a failed pump will destroy a new CP4 within minutes.
Inspect and flow‑test all injectors – Worn or stuck injectors with high return flow will prevent the pump from building correct rail pressure and will cause repeat pump failure. Have all injectors professionally tested and cleaned, or replaced as necessary.
Prime the low‑pressure circuit – Before starting the engine, use a hand vacuum pump on the fuel return line to pull bubble‑free fuel through the pump and filters. CP4 pumps are extremely sensitive to aeration — never dry‑crank the pump.
Fill the pump with clean diesel – Remove the high‑pressure outlet fitting and pour clean, lubricious diesel (or Bosch special assembly lubricant) into the pump housing to prevent dry start scoring of the plungers and eccentric cam.
Torque all connections to specification – High‑pressure outlet (M14×1.5 cone seat): 35–40 Nm. Low‑pressure inlet and return: 25 Nm. Drive shaft nut: consult the vehicle workshop manual (typically 80–100 Nm for VAG 2.0 TDI engines).
Reset fuel adaptations – After installation, use a diagnostic tool (VCDS or equivalent) to clear learned fuel trim values and perform a “high‑pressure pump adaptation” or “fuel system learn” routine.
Perform a leak test – Idle the engine for 10 minutes, then inspect all high‑pressure and low‑pressure unions, the pump mounting area, and the drive shaft seal for any signs of fuel wetness.
Monitor rail pressure – Using live data on your diagnostic tool, verify that actual rail pressure tracks within ±20 bar of the specified value across all RPM ranges.
💡 Pro Tip – CP4 pumps are notoriously sensitive to water contamination and low‑quality diesel. Always drain the water separator regularly. Consider using a high‑quality fuel additive with lubricity enhancer, especially when running biodiesel blends.
4. Why Choose Rsolid Engine Parts as Your Supplier
✅ Exact Bosch CP4S1 Compatibility – Direct replacement for 0445010533 in all listed VW, Audi, Seat and Skoda 2.0 TDI applications, including engine code CLC, CFFB, CFGB, CFHC and many others. No modifications required.
✅ 100% Calibration Tested – Each pump is run on a Bosch EPS 200 or equivalent test bench to verify delivery volume, rail pressure stability (1,800 bar capability), ZME regulator response, and leak‑free operation. Test reports are available on request.
✅ 12‑Month Warranty – Full coverage against manufacturing defects for all pumps supplied, even for high‑mileage vehicles.
✅ Competitive Pricing for Workshops & Dealers – Volume discounts available for mechanics, independent garages, parts distributors, and fleet operators.
✅ Fast Worldwide Shipping – Stock held in multiple warehouses for rapid dispatch to Europe, Asia, Africa, the Americas, and the Middle East.
✅ Expert Technical Support – Our diesel injection specialists provide pre‑purchase fitment verification, diagnostic assistance, and detailed installation guidance via WhatsApp or email.
Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com
