BOSCH Four-Port Injector – 0445120104=0445120207=A4720700787=A4720700387=A4720700587=0986435539 – The Cross-Platform Fueling Standard For Mercedes-Benz Heavy-Duty

In the world of commercial diesel, the boundary between engine platforms is often defined by part numbers. Yet some injectors transcend these boundaries, serving as the common fueling denominator across multiple engine families, emissions stages, and vehicle applications. The cross-reference string 0445120104, 0445120207, A4720700787, A4720700387, A4720700587, and 0986435539 represents one such boundary-crossing injector – a four-port solenoid design that serves both the OM471 and OM472 engine families from Mercedes-Benz, as well as a range of industrial and off-highway applications. This six-number cluster is not a collection of different parts; it is a unified hydraulic specification that has been certified under multiple catalogues to simplify parts management for workshops, fleets, and distributors worldwide.

The 0445120104 and 0445120207 are functionally interchangeable, but they exhibit a subtle distinction in their solenoid coil characteristics. The 0104 uses a standard winding configuration that provides consistent performance across most operating conditions. The 0207 employs a modified winding with a slightly lower inductance, allowing the current to rise approximately 5% faster when the ECU applies voltage. This faster rise can be advantageous in engines with older ECU driver stages or in high-RPM applications where injection windows are extremely short. In modern OM471 and OM472 ECUs with fast-switching drivers, the difference is negligible. Both injectors are directly interchangeable, and neither requires software adjustment when substituted for the other.

The three A472 numbers (A4720700787, A4720700387, A4720700587) all reference the same injector specification for the OM472 engine platform:

A4720700387 – Early OM472 Euro-6 Stage B (approximately 2016-2018)

A4720700587 – Mid-production OM472, transitional calibrations (approximately 2018-2020)

A4720700787 – Late OM472 Euro-6 Stage C (approximately 2020-present), current supersession

Mercedes-Benz has progressively superseded the earlier A472 numbers with A4720700787, which is the current service reference. All three numbers are interchangeable, and A4720700787 serves as the direct replacement for both A4720700387 and A4720700587.

The Bosch aftermarket number 0986435539 is the service part reference used by independent distributors worldwide. This number appears in catalogues from Bosch and major aftermarket suppliers. The 0986435539 injector is manufactured on the same production lines as the OEM injectors, using identical materials, tolerances, and quality control processes. The difference is exclusively in packaging and distribution channel – the injector itself is identical to the 0445120104/0207 and the A472 numbers.

This injector family is specified for:

Mercedes-Benz Actros (OM471 and OM472 engines, Euro-5 and Euro-6 variants)

Mercedes-Benz Arocs (construction and heavy-haulage, OM471/OM472)

Mercedes-Benz Antos (distribution trucks, OM471/OM472)

Mercedes-Benz Econic (municipal vehicles, selected applications)

FUSO Super Great (with Mercedes-based engine platforms)

Selected Caterpillar and MTU industrial engines using Bosch injection components

The injector class code – the alphanumeric character on the original injector label – remains the critical compatibility factor. Our database covers over 900 Mercedes-Benz configurations; we can confirm the correct class code using the VIN or engine serial number.

Q1: What is the difference between the A471 and A472 injector families? Are they interchangeable?

A: The A471 numbers (covered in our previous cross-reference) are for the 12.8-litre OM471 engine. The A472 numbers in this cross-reference are for the 15.6-litre OM472 engine. While the injector core is similar, the calibration and class codes differ between the two engine families. Always use the injector specified for your engine platform – the class code must match the ECU calibration.

Q2: I have an OM471 with 0445120104 injectors. Can I replace them with 0445120207?

A: Yes, 0445120104 and 0445120207 are functionally interchangeable. The 0207 has a slightly faster current rise due to lower coil inductance, but both are within the ECU's compensation range. No software changes are required.

Q3: What is the supersession path for the A472 numbers in this cross-reference?

A: The supersession path is A4720700387 → A4720700587 → A4720700787. A4720700787 is the current active service number and replaces both earlier numbers. If your original injectors are A4720700387 or A4720700587, you can order A4720700787 as the direct replacement.

Q4: Is the Bosch aftermarket number 0986435539 the same quality as the Mercedes OEM injectors?

A: Yes, 0986435539 is manufactured by Bosch to the same specification as the OEM injectors. It is the same component sold through independent aftermarket channels. The quality, materials, and testing procedures are identical.

Q5: Can I use injectors from this cross-reference in a truck that originally had a different class code?

A: The class code (e.g., "C1," "D2") must match the ECU's calibration. Installing an injector with the wrong class code will cause adaptation errors and rough running. We can confirm the correct class code using your VIN or engine serial number.

Q6: What is the expected service life for these injectors in line-haul service?

A: With regular fuel filter maintenance (every 30,000-40,000 km) and good fuel quality, these injectors typically provide 500,000-700,000 km of reliable service. We recommend a leak-off test every 100,000 km. When the average leak-off exceeds 3.0 ml/min per injector, replacement or reconditioning is due.

 

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