How to Read a Bosch Injector Part Number (0445120, 0445110, 0432)
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Bosch common rail injectors are fitted to thousands of truck, bus, tractor and construction engines from Cummins, Iveco/FPT, MAN, DAF, Deutz, Komatsu, Hyundai and many others. When you need a replacement, the number on the injector body is the fastest way to find the correct part. This guide explains how to read a Bosch injector number and how it relates to the engine manufacturer's own part number.
Where to find the number
The Bosch number is laser-etched or printed on the injector body, usually near the electrical connector or on the upper housing. You may need to clean the injector to read it. Next to the Bosch number there is often a second code: the engine manufacturer's (OEM) part number, for example a Cummins, Iveco or Komatsu reference.
What the Bosch number means
Bosch diesel injector numbers are 10 digits long. The first digits tell you the product family:
- 0445 110 … – common rail injectors, mostly for passenger cars and light commercial vehicles (CRI1 / CRI2 families).
- 0445 120 … – common rail injectors for medium and heavy-duty commercial and off-highway engines (CRIN families).
- 0445 115 / 0445 116 / 0445 117 … – piezo common rail injectors, mainly for passenger cars.
- 0432 … / 0433 … – conventional mechanical injectors and nozzle holders for older pump-injection engines.
The last digits identify the exact variant. Two injectors that look identical can have different nozzle hole sizes, spray angles or calibration, so you should always match the complete number – for example 0445120231 and 0445120224 are not interchangeable.
Bosch number vs. OEM number
Engine manufacturers give the same injector their own reference. A Cummins QSB6.7 injector, for instance, can be listed as Bosch 0445120231 and Cummins 3976372 or 5263262. Our product pages show both the Bosch reference and the known cross-reference numbers, so you can search with whichever number you have.
Reman and exchange suffixes
Some injectors carry extra letters or numbers after the main code, such as "RX", "NX" or "PX" on Cummins numbers. These usually indicate a remanufactured or exchange unit rather than a different injector. When in doubt, send us the full code and a photo of the label.
Checking compatibility before you order
- Read the full Bosch number from your old injector.
- Note the OEM number and the engine model (for example Cummins ISB6.7, FPT N67 or Deutz TCD 2013).
- Search the number in our store or browse the Bosch common rail injector collection.
- If the numbers do not match exactly, contact us – some injectors have approved replacements with a different number.
Why the correct injector matters
The engine control unit is calibrated for a specific injector. A wrong variant can cause poor starting, smoke, fault codes or loss of power. Many modern Bosch injectors also carry an IMA or QR correction code that should be programmed into the ECU after installation, so the engine can compensate for small flow differences between injectors.
Need help?
Every injector from InjectorHub is flow-tested before shipping and covered by a 12-month warranty. Browse all Bosch reference injectors or the Cummins and Deutz collections, or send us your injector number and we will find the right part for you.