Delphi EJBR04201D Fuel Injector for MERCEDES-BENZ OM 646

The Delphi EJBR04201D is a fuel injector for selected MERCEDES-BENZ applications with engines from the OM 646 family. Fitment requires cross-checking the part number, full engine code and vehicle details; the model designation alone is not sufficient.

The Delphi EJBR04201D is a fuel injector for selected MERCEDES-BENZ C-Class and E-Class models with engines from the OM 646 family.

Component identification and confirmed reference numbers

For part selection, the manufacturer and reference form a fixed pair: Delphi EJBR04201D. This identification is the starting point for comparison with the removed fuel injector and the vehicle-specific catalogue listing. A match with the C 220 CDI or E 220 CDI designation alone is not sufficient proof of fitment.

• Manufacturer reference: Delphi EJBR04201D.
• Secondary shop search reference: Dieselfixneuss DFN-EJBR04201D.
• Component type: Fuel injector for the listed diesel applications.

The DFN reference is used to find the corresponding item at Dieselfixneuss. It is neither an additional Delphi manufacturer number nor a MERCEDES-BENZ OE number. No cross-reference numbers explicitly identified as OE are available here for EJBR04201D; treating them as equivalent would therefore not be substantiated.

When recording the markings on the old part, every character of the reference must be retained. A Delphi number with a similar format does not establish interchangeability. Illegible characters must be clarified before ordering, rather than inferred from the vehicle model or engine family.

Representative TecDoc vehicle fitment for C-Class and E-Class

The verified TecDoc fitment data covers a total of 13 vehicle applications. The following table shows the supplied representative selection of ten entries, not the complete application list. It covers W211, S211, W204 and S204, along with all engine and type variants included in the selection.

The entries for the E 220 CDI (211.008) show why power output and production period must also be checked: the selection includes both 163 metric hp and 170 metric hp. Likewise, the fitment listed for the E 200 CDI (211.007) with OM 646.820 must not be applied without verification to the E 200 CDI (211.207) with OM 646.821.

Check fitment using the old part, engine code and vehicle details

Before ordering EJBR04201D, three sources of information must be brought together: the markings on the existing fuel injector, the full engine code and the specific vehicle details. The designation OM 646 alone is too broad. The selection includes the variants OM 646.820, OM 646.821, OM 646.811 and OM 646.812.

1. Read the old part number: Record the manufacturer markings and complete part number on the existing fuel injector. If the reference differs, interchangeability must be confirmed separately.
2. Identify the engine code: Establish the full variant, including the digits after the decimal point. Two engine codes are listed in the selection for the C 200 CDI (204.007, 204.006).
3. Cross-check vehicle details: Have the vehicle identification number, type variant, power output and production period ready for an exact catalogue check. The first registration date does not replace checking the relevant production period.
4. Compare the physical design: Compare the connector, housing shape, connections and old part markings. A visual match supports the reference check but does not replace it.

For a C 220 CDI (204.008), the deciding factor is therefore not the model designation alone, but confirmed fitment for the specific vehicle variant. If discrepancies between the old part number and catalogue entry remain, the order should be put on hold. Photos of the markings and connections help resolve these discrepancies directly.

Assess symptoms and select the correct fuel injector

Rough running, difficult starting or unusual combustion noise can justify checking the injection system. They do not, however, prove that the Delphi fuel injector is faulty. On an OM 646, the fuel supply, electrical actuation and mechanical engine condition must be considered separately as possible contributing factors.

Excessive internal leakage can impair pressure build-up in the injection system. A correctly performed leak-off test can help narrow down the cause; its results must be assessed against the vehicle-specific test requirements. No leak-off limits or test pressures are given here for EJBR04201D because no confirmed values are available.

Correction values displayed by the diagnostic tool are also an indication, not a reason for replacement on their own. On a C-Class W204 or E-Class W211, abnormal values must be consistent with the symptoms and other test results. A fault code relating to the fuel injector also requires checking the connector and wiring before condemning the component.

A replacement injector is then selected by the confirmed reference, not by the symptom. Neither a standard scope of supply nor specific installation values are confirmed for the Delphi EJBR04201D. Required seals, installation requirements and any necessary adaptation procedures must therefore be clarified for the relevant MERCEDES-BENZ variant before installation.

Frequently Asked Questions