Bosch fuel injectors are among the most commonly used fuel injection products in the global automotive and diesel engine aftermarket. From gasoline injectors for passenger cars to high-pressure common rail injectors used in commercial vehicles and construction equipment, Bosch products can be found across a wide range of applications.
When purchasing or replacing an injector, the part number is often one of the most important pieces of information for confirming whether the product is a correct match.
For example: 0280156357 and 0445120236
Although both are Bosch injector part numbers, they belong to completely different fuel injection systems.
In addition, the injector nozzle inside an injector assembly may use another type of identification number.
Such as:DLLA150P…, DSLA…, ZCK150S435
So, what do these numbers and letters mean? This guide explains how to identify common Bosch injector part number formats and injector nozzle numbers.
What Does a Bosch Injector Part Number Look Like?
Bosch fuel system components commonly use 10-digit part numbers, which may appear with spaces on the actual product label.
For example: 0 280 156 357
On websites, quotations, or other parts catalogs, it is commonly written as: 0280156357
The same applies to diesel common rail injectors.
For example: 0 445 120 236 is commonly written as: 0445120236
Therefore:0 445 120 236 = 0445120236
These two formats generally refer to the same Bosch injector part number; the only difference is the formatting.
When identifying a Bosch injector, the first few digits are particularly important because they can help indicate the general product series.
Bosch Gasoline Injector Part Numbers
One common type of Bosch gasoline injector part number begins with:028…
For example:0280156357
These numbers can be understood according to their product series.
0280 Prefix
0280 is a very common number series used for Bosch gasoline fuel injection components.
Therefore, when you see a Bosch number such as: 0280XXXXXXXX
you should first search within gasoline fuel injection components rather than confusing it with a 0445… diesel common rail injector.
What Does the 028015 Series Mean?
Bosch gasoline injectors frequently use numbers beginning with:028015…
This series includes many electronically controlled gasoline injectors and covers different design generations and configurations, including those commonly referred to as:EV1, EV6, and EV14.
However, one important point should be noted:
You cannot determine that an injector is definitely EV1, EV6, or EV14 simply by interpreting a few digits in the part number.
What Is the Difference Between EV1, EV6, and EV14?
Bosch gasoline injectors have evolved through several generations, and EV1, EV6, and EV14 are commonly encountered in the aftermarket.
| Feature | EV1 | EV6 | EV14 |
|---|---|---|---|
| Era | 1980sโ1990s | 2000sโ2010s | 2010sโPresent |
| Connector/Body Design | Older, generally larger design | More compact/modern design | Compact later-generation design |
| Typical Applications | Older EFI applications | Wide range of modern EFI applications | Later performance/OE applications |
| Direct Interchangeability | Application-dependent | Application-dependent | Application-dependent |
Two Bosch gasoline injectors that look similar are not necessarily directly interchangeable.
What Do the Last Digits of a Bosch Gasoline Injector Part Number Mean?
For example: 0280156357
The later digits distinguish the specific product configuration.
Different part numbers may correspond to different:
- Flow Rate
- Spray Pattern
- Injector Length
- Electrical Resistance
- Connector Type
- Fuel Rail/Application
- OEM Application
A Bosch Part Number Is Not a Complete โTechnical Specification Codeโ
Bosch Diesel Common Rail Injector Part Numbers
Another very important Bosch diesel injector series begins with: 0445
For example: 0445110646 and 0445120236
These numbers are widely found on Bosch high-pressure diesel fuel system components.
044511 Series
For example:0445110646
The 044511 series includes many Bosch common rail injectors.
They are commonly found in:
Passenger diesel vehicles, light commercial vehicles, and some medium-duty diesel engine applications.
Different generations, engines, and emissions standards use different specific part numbers. Therefore, you cannot assume interchangeability simply because two injectors begin with 044511.
044512 Series
For example: 0445120236
The 044512… series is particularly common in medium- and heavy-duty diesel engine applications.
Typical applications include:
- Heavy-Duty Trucks
- Construction Equipment
- Agricultural Machinery
- Industrial Diesel Engines
What Is the Difference Between 044511 and 044512?
The following table provides a quick general comparison:
| Bosch Series | Typical Market |
|---|---|
| 044511… | Passenger cars, light commercial vehicles and various diesel applications |
| 044512… | Medium/heavy-duty diesel engines, trucks and heavy equipment |
| Exact Part Number | Determines the specific injector application |
However, this is only a general guideline for identifying the product series.
To determine whether an injector is suitable for a specific engine, you must check the complete 10-digit Bosch Injector Part Number.
What Do the Last Digits of a Bosch Common Rail Injector Part Number Mean?
For example: 0445120236 and 0445120231
Although they belong to the same series, they are two different injectors.
The complete part number distinguishes different:
OEM applications, engine configurations, injector calibrations, fuel system versions, and related technical specifications.
What Is the Difference Between a Bosch Injector Part Number and an OE Number?
It is also important to distinguish between:
Injector Part Number and Injector Correction/Calibration Code
They are completely different.
For example:0445120236
is the injector’s product part number.
After installing certain electronically controlled common rail injectors, the ECU may also require the injector’s individual:
IMA / IQA / Correction Code
These correction codes represent the individually calibrated characteristics of a particular injector.
Therefore: Bosch Part Number โ Injector Correction Code
A Bosch Injector Part Number such as 0445120236 should not be entered into the ECU as an injector correction code.
How to Understand Injector Nozzle Numbers?
Injector nozzle numbers generally contain more structural information than a complete injector part number.
Different engines have different:
Displacements, power ratings, combustion chamber designs, fuel pressures, and applications.
Therefore, their injector nozzles may differ in:
Dimensions, number of spray holes, spray hole diameter, and spray angle.
Take the traditional nozzle number:
ZCK150S435
as an example.
ZCK: Injector Nozzle Type
ZCK represents the corresponding injector nozzle design.
Traditional injector nozzle numbers may use different letter combinations to distinguish:
Pintle-type, multi-hole, and different nozzle structures and dimensions.
The exact definition of these letters should be verified according to the corresponding nozzle manufacturing standard or product catalog.
150: Spray Angle
In this numbering format:
150 = 150ยฐ Spray Angle
This represents the specified spray angle of the injector nozzle.
The spray angle must match the design of the engine combustion chamber.
An incorrect spray angle may prevent the fuel from being injected into the intended combustion area.
S: Nozzle Size Code
In this traditional numbering system, letters can be used to indicate the dimensional class of the needle valve body/nozzle body.
For example:
| Code | Nominal Size |
|---|---|
| R | 16 mm |
| S | 17 mm |
| T | 22 mm |
| U | 30 mm |
| V | 42 mm |
| W | 50 mm |
Therefore, in ZCK150S435:
S = 17 mm
435: Number and Diameter of Spray Holes
According to this numbering format:
4 = 4 spray holes
35 = approximately 0.35 mm hole diameter
Therefore:
ZCK150S435
can be understood within this numbering system as:
Long multi-hole nozzle + 150ยฐ spray angle + S size class + 4 holes ร approximately 0.35 mm hole diameter
However, this interpretation cannot be directly applied to Bosch DLLA, DSLA, or all other injector nozzle numbers. Different manufacturers and product series use different naming systems.
How to Correctly Identify a Bosch Injector?
If you have an old Bosch injector, use the following identification process.
Step 1: Find the Complete Bosch injector part number.
Look for a number such as: 0 445 120 236 and 0 280 156 357
When searching online, you can remove the spaces: 0445120236
Do Not Buy an Injector Based on Appearance Alone.
Two Bosch injectors may have:the same connector, the same installation dimensions, or even an almost identical appearance while their internal injection characteristics and calibration can be completely different.
Therefore, the complete Bosch injector part number should always be one of the primary references used for identification.
Conclusion
Understanding a Bosch injector part number is not about trying to โtranslateโ every digit into an individual technical specification. The first step is to identify the product series and then use the complete part number, OE cross-reference, and engine application information to confirm the correct product.
For common products, you can use the following as a quick reference:
0280… โ Bosch gasoline fuel injection-related products
044511… โ Common Bosch Common Rail Injector series
044512… โ Common Rail Injector series frequently used in medium/heavy-duty diesel engines, commercial vehicles, and construction equipment
DLLA / DSLA / ZCK… โ Injector Nozzle numbers rather than complete Injector Part Numbers
Most importantly:
Similar part numbers do not mean that injectors are interchangeable, and similar appearances certainly do not guarantee interchangeability.
FAQ
Are All Bosch Injector Part Numbers 10 Digits?
Many Bosch fuel system components use a common 10-digit part number format, such as: 0445120236
However, actual product labels, remanufactured part numbers, Bosch Exchange Numbers, OEM numbers, or other product series may use different formats.
Are 0 445 120 236 and 0445120236 the Same Part Number?
Usually, yes.
The first is one of the standard Bosch display formats with spaces, while the second is the continuous-number format commonly used on e-commerce websites and in parts databases.
Can You Determine Injector Flow Rate From a Bosch Part Number?
Usually, you cannot determine the exact flow rate from the part number alone.
The complete Bosch injector part number can help identify the correct product, but specifications such as flow rate, pressure, and spray characteristics should be checked using verified product data.
Are 044511 and 044512 Injectors Interchangeable?
Interchangeability cannot be determined from the series prefix alone.
You must verify the complete Bosch injector part number, OE number, engine application, and fuel system requirements.
Are the Bosch Injector Number and IMA/IQA Code the Same?
No.
A Bosch injector part number identifies the injector product model.
An IMA/IQA Code contains individual injector correction data used by certain common rail systems.
They serve completely different purposes.
Farin
Kingsley
Hi, Iโm Kingsley, the author of this post. With over 30 years of experience in manufacturing and supplying excavator parts, we serve customers in more than 50 countries. We provide reliable, high-quality components for construction, mining, agriculture, and heavy equipment applications. If you need durable excavator parts or a free quote, feel free to contact us.
