Bosch 0445110601 CRI 2.16 Injector – The Robust Solenoid Solution for VW/Audi 2.0 TDI & Ford Duratorq Diesel Engines

Q1: Can the 0445110601 be replaced with a coded injector (like the 0445110654) by simply not entering the code?
No – coded injectors have different internal calibration and require the code for proper cylinder balancing. The ECU expects a specific flow value; operating without the code will result in a permanent rough idle and a fault code for "fuel trim imbalance." Always replace with the same part number or a service-approved substitute.

Q2: How do I perform a leak-off test on the 0445110601 for a VW 2.0 TDI engine?
Disconnect the fuel return hoses (typically connected to the injector tops) and connect clear tubing to a graduated cylinder. Run the engine at idle (850 rpm) for 60 seconds. A healthy injector returns ≤20 ml/min. If any injector returns more than 35 ml/min, replace it. Compare the values across the four cylinders – a 10+ ml/min difference indicates the higher-flow injector is faulty.

Q3: Why does the engine start perfectly when cold but smoke heavily under acceleration when warm?
This is typical of a control valve that has eroded. As the fuel temperature rises, its viscosity drops, increasing the internal leakage through the worn valve. The ECU commands the same injection duration, but the delivered fuel volume is reduced, causing lean misfire and white smoke. Replacing the affected injector(s) resolves the issue.

Q4: Can the 0445110601 be used in a Ford Transit 2.2L Duratorq engine?
Yes, but only if the engine code matches the calibration. The Ford 2.2L Duratorq uses a similar Bosch CRI injector, but the 2.2L variant (Puma engine) often requires the 0445110607 or 0445110609. Always verify the engine code and the original injector part number before ordering – the 2.0L and 2.2L have different flow requirements.

Q5: What is the expected service life of the 0445110601 injector in a passenger car?
With 5 µm fuel filtration and regular oil changes (every 15,000 km), the injectors typically last 150,000–200,000 km. Return flow should be checked at every 50,000 km – if any injector exceeds 30 ml/min, plan to replace it within the next 20,000 km. In high-idle applications (taxis, urban delivery), the service interval may reduce to 120,000 km.

Q6: How can I tell if the DLC coating on the nozzle is worn?
Wear of the DLC coating is not directly visible without removing the nozzle, but its symptom is a persistent cold-start stumble – the engine misfires for the first 3–5 seconds until the rail pressure builds and pushes the needle past the increased friction. If a leak-off test shows normal values but the cold-start stumble persists, the DLC coating is likely compromised and the injector should be replaced.