Bosch 0445120266 — Common-Rail Fuel Injector (Weichai WP10 / WP12 Applications)

The Bosch 0445120266 (also listed as 0 445 120 266, 612640090001, 612630090012) is a high-precision common-rail injector commonly fitted to Weichai WP10 / WP12 diesel engines. Engineered to deliver repeatable spray patterns and exact micro-metered fuel doses, this injector helps maintain engine power, lowers smoke, and supports modern after-treatment strategies on heavy-duty trucks and industrial machines.

 

 

Optimized combustion: Precise nozzle geometry improves atomization for more complete fuel burn and better fuel economy. 

Reliable replacement: Available as OEM Bosch units, verified remanufactured assemblies, and high-quality aftermarket alternatives to suit lead-time and budget needs. 

Fleet uptime: Fast swapping of a faulty injector often restores drivability without replacing pumps or more expensive components-priority for fleet operators.

 

 

Part numbers / cross refs: 0445120266 · 0 445 120 266 · 612640090001 · 612630090012

Typical fitment: Weichai WP10 / WP12 Euro IV engine families (used in trucks, buses and industrial installations).

Supply types: New OEM boxed units, remanufactured injectors with bench certificates, and aftermarket units (warranty terms vary).

 

 

Verify fitment before purchase - always confirm your engine code, VIN or injector tag; look for the 0445120266 marking to avoid mismatches. 

Cleanliness first - ultrasonic clean the body and surrounding area before disassembly; contamination is the top cause of immediate failure after rebuild. 

Seal kit + flow match - install new copper washers and O-rings, then flow-match injectors on a calibrated bench to ensure cc/min consistency across cylinders. 

Post-fit validation - clear fault codes, run an idle/load test, and monitor rail pressure and smoke levels to confirm correct operation.

 

 

Poor cold starts, rough idle or loss of low-end torque.

Increased black smoke or failed DPF regeneration cycles.

Diagnostic trouble codes related to rail pressure or injector misfires.
If you see these signs, bench-test return flow, spray pattern and pop pressure before replacing the injector.

 

 

OEM vs aftermarket: OEM Bosch units provide factory traceability and full warranty; reputable remanufacturers should supply flow sheets and photos.

Ask sellers for: test certificates (flow & leakage), part-tag photos, included seals, and warranty terms. For bulk orders request batch inspection reports and lead-time guarantees.

Typical pricing: Market offers vary by origin - from cost-effective aftermarket listings to premium OEM pricing; always compare bench-tested reman vs new OEM for total cost of ownership.

 

 

The 0445120266 is a mission-critical injector for Weichai WP series engines - small, precise, and decisive for combustion quality.

 

 

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