Bosch 0445110574 Diesel Injector

On the 2.1L CDI platform, a failing Bosch 0445110574 injector typically presents as: hard starting, especially cold; rough idle or vibration; diesel smell from the oil dipstick or a rising oil level; black carbon build-up around an injector base; misfire-like running with the warning light on.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: injector seal leakage — the documented weak point of the later solenoid-injected engines, producing blow-by and carbon ('black death') around the injector base; fuel dilution of the engine oil from a leaking injector; injector wear degrading idle quality on high-mileage engines.

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

Inspect around every injector for black crust — on this era the seal and seat are the usual culprits, not the injector body. Check the engine oil for diesel smell or a rising level: fuel dilution is a stronger warning sign than rough idle alone. Clean or recut the injector seat and fit a new sealing washer on every refit. Check injector correction values across all four cylinders to identify an outlier.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured 0445110574 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

0445110574 supersedes or cross-references 6 further OE numbers, including 0445110573, 0986435286, 6510703187, A6510703187, 651070318780 and A651070318780. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.