OM651950 Diesel Injectors
Common-rail diesel injectors with full UK warranty
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Select the correct injector for your OM651950 engine below
Top injectors for OM651950
Compatible Injectors for OM651950
- OEM Tested
- 12-Month Warranty
- Free UK Delivery
Common problems solved by these injectors
About the OM651950 engine
The OM651950 is a 2.1l cdi common rail diesel engine. This engine uses Bosch diesel injectors.
How Diesel Injectors Are Remanufactured
Watch our 3D walkthrough of the diesel injector remanufacturing process and see how injectors are professionally restored for reliable service.
Vehicles Using OM651950 Engine
Vehicle data not yet available for this engine code.
Common OM651950 Injector Problems
Rough idle and engine vibration
Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
Excessive exhaust smoke
Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
Poor fuel economy
A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
Engine misfire under load
Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
Difficult cold starting
Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.
Loss of power
Gradual power loss across the rev range, particularly above 2500 RPM, can indicate injector flow rate degradation.
Increased diesel knock
Louder than normal combustion noise, especially at idle, can indicate incorrect injection timing due to worn injector internals.
OM651950 Technical Specifications
Displacement
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Power
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Torque
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Fuel System
Common Rail Direct Injection
The OM651950 is a 2.1l cdi common rail diesel engine. This engine uses Bosch diesel injectors.
Engine Intelligence
Mercedes 2.1 CDI (OM651.950-era — Bosch solenoid injection, C/E-Class, Sprinter, Vito)
Documented failure modes
- 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
Diagnostic guidance
- 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
Fitment note: This guidance covers the later Bosch solenoid-injected OM651 engines — the earlier Delphi piezo era uses a completely different injector; the two are NOT interchangeable. Match the reference etched on the injector body.
Related OM651950 Engine Guides
Related Pages
Bosch 2.1L CDI — browse compatible engines, vehicles, and injectors
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