2.1L CDI · Remanufactured
2.1L CDI Remanufactured Common Rail Injector (Mercedes-Benz OM651)
OM651950
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 appear together, suspect the injector before peripherals — a comparative leak-off test isolates the failed unit without tear-down.
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.
Each remanufactured 0445110574 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is calibrated on a common-rail test bench against the manufacturer's specification — delivery, back-leak and response verified — and despatched with a 12-month parts warranty and its calibration data on file.
0445110574 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.
UK diesel injector specialists supplying OEM tested and calibrated remanufactured injectors. Trusted by garages and mechanics nationwide with 12-month warranty on every part.