0445110294 Fuel Injector – Bosch-Compatible Common Rail Injector for Mercedes-Benz OM 646.9 Diesel Engine
The 0445110294 common rail solenoid injector (Bosch compatible) is a precision fuel injection component specifically engineered for the Mercedes-Benz OM 646.9 series diesel engine – a 2.2L CDI powerplant found in numerous Mercedes-Benz passenger cars, vans, and SUVs. This injector delivers factory-correct spray patterns, improved cold-start performance, reduced diesel knock, and lower emissions. Below we examine its structural advantages, vehicle fitment, common failure signs, installation best practices, and why Rsolid engine parts is your ideal supplier.
1. Structural Advantages of the 0445110294 Injector
The 0445110294 belongs to Bosch’s CRI2‑20 solenoid injector family, offering proven engineering for Mercedes diesel applications:
High‑speed magnetic solenoid – Achieves opening times below 0.2 ms at 1,600 bar, enabling up to five injection events per cycle (pilot, pre, main, after, post). This significantly reduces combustion noise (“diesel clatter”) and lowers NOx and particulate emissions.
Hardened stainless steel body – Rated for rail pressures up to 1,800 bar and resistant to corrosion, cavitation, and high thermal cycling – ideal for engines operating under varying loads.
6‑hole micro‑sac nozzle – Laser‑drilled orifices produce an ultra‑fine fuel spray that matches the OM 646.9‘s swirl‑intake combustion chamber, improving cold starts, reducing soot, and extending DPF (Diesel Particulate Filter) life.
Balanced hydraulic servo system – Minimizes internal leakage and ensures consistent injection quantity across all four cylinders, critical for smooth idle and balanced power delivery.
Plug‑and‑play electrical connector – Matches OEM pin assignment and coil resistance (0.23–0.27 Ω), allowing direct ECU connection without modifications.
These features translate into quieter operation, lower fuel consumption, and reliable performance across the engine’s service life.
2.Detailed vehicle list (Mercedes-Benz models):
| Model | Chassis / Series | Years | Engine Code | Notes |
|---|
| C-Class | W203 (C200 CDI, C220 CDI) | 2003–2007 | OM 646.9 | 2.2L CDI |
| C-Class | W204 (C200 CDI, C220 CDI) | 2007–2010 | OM 646.9 | Pre‑facelift |
| E-Class | W211 (E200 CDI, E220 CDI) | 2003–2009 | OM 646.9 | 2.2L CDI |
| CLK | W209 (CLK 220 CDI) | 2004–2009 | OM 646.9 | 2.2L CDI |
| Sprinter | W906 (208/308/408/509 CDI) | 2006–2016 | OM 646.9 | 2.2L CDI van |
| Viano / Vito | W639 | 2004–2014 | OM 646.9 | 2.2L CDI |
| ML-Class | W164 (ML 220 CDI) | 2005–2008 | OM 646.9 | SUV (select markets) |
3. Common Failure Symptoms & Installation Replacement Advice
The OM 646.9 engine is known for injector wear after 150,000–200,000 km or due to fuel contamination. Recognising early symptoms prevents costly DPF, EGR, or turbocharger issues.
Typical failure symptoms of a failing 0445110294 injector:
Rough idle, especially when warm – Engine shakes at traffic lights; cylinder balance values > ±2.0 mg/stroke (visible on STAR Diagnostic tool).
Excessive black smoke under acceleration – Over‑fueling due to worn needle seat or stuck solenoid.
White smoke on cold start – Poor atomisation from a clogged or worn nozzle tip.
Hard starting or extended cranking – Rail pressure cannot build due to internal leakage (return flow > 30 ml/min at idle).
Increased fuel consumption – Fuel is pumped but not properly injected; return fuel volume high.
Engine oil dilution – Diesel leaks past injector tip into cylinders, then past rings into sump. Check for rising oil level and diesel smell – dangerous.
Loss of power under load – One or more injectors delivering insufficient fuel.
Frequent DPF regeneration (if equipped) – Excess soot production clogs the filter quickly.
Injector circuit trouble codes – Solenoid coil electrical failure (P0201–P0204 for respective cylinders).
Black smoke on overrun (deceleration) – Injector needle not closing fully due to contamination.
Installation & replacement best practices for OM 646.9 engine:
Always replace all sealing components – Use a new copper sealing washer (14mm ID), upper and lower O‑rings (Bosch seal kit 2 418 227 053 or equivalent). Never reuse old seals – they cause combustion blow‑by.
Clean the injector bore thoroughly – Use a 14mm injector seat reamer to remove carbon deposits from the cylinder head. Even a thin carbon layer prevents proper sealing.
Lubricate new O‑rings with clean diesel fuel – Never use grease or engine oil, which can block fine internal passages.
Torque injector hold‑down clamp precisely – For OM 646.9: typical 25 Nm + 90° (use a new clamp bolt each time). Always consult the service manual. Over‑torquing distorts the injector body; under‑torquing causes leakage and combustion gas ingress.
Replace the fuel filter – Contaminated fuel is the #1 killer of new injectors. Install a genuine Mercedes fuel filter (A 611 092 03 01 or equivalent).
Prime the fuel system – Use the hand primer on the fuel filter housing or cycle ignition to run the lift pump (if equipped). Never crank without priming – dry firing damages new injectors.
Code the injector using a diagnostic tool – The 0445110294 has a 10‑character IMA (Injector Matching Adjustment) code laser‑marked on its top. Using Mercedes STAR Diagnostic, Autel MaxiSys, Launch X431, or other professional scanner, enter the code into the ECU. Without coding, the engine will run unevenly and may trigger fault codes.
Perform leak‑off test after installation – Run engine at idle for 2 minutes, then measure return fuel from each injector using graduated cylinders. All should be below 20 ml/min and within 5 ml/min of each other.
Reset adaptation values – After coding, perform “Injector Quantity Adaptation” and “Fuel Pressure Adaptation” via diagnostic software. For STAR Diagnostic, run “Teach-in of injectors” routine.
Road test – Drive for 15–20 minutes to allow ECU to fine‑tune adaptations.
4. Why Choose Rsolid Engine Parts as Your Supplier?
At Rsolid engine parts, we specialise in high‑quality diesel fuel injection components. Here‘s why workshops, fleets, and individual owners trust us:
100% test‑bench verified – Every 0445110294 injector is calibrated on a professional common rail test bench (up to 2,000 bar) with flow balance guaranteed within ±2%.
Bosch‑compatible, OE fitment – Direct replacement for Mercedes A6460701187 series; matches all dimensions, solenoid resistance, and spray angles.
New build, not remanufactured – All units are newly manufactured to Bosch specifications, not reconditioned or repaired.
Competitive wholesale pricing – Ideal for volume buyers, repair shops, and individual owners.
Fast global shipping – Stock available from our warehouses in Asia, Europe, and North America.
Expert technical support – Our team helps with IMA coding, torque specifications, and troubleshooting for OM 646.9 and similar engines.
12‑month warranty – Against manufacturing defects and premature wear.
📧 Contact us for a quote or technical assistance:
✉️ Email: amy@rinjector.com
🌐 Website: www.rinjector.com
