EJBR04201D — Technical Research
Delphi solenoid common-rail injector for the Mercedes-Benz OM646 2.1/2.2 CDI four-cylinder diesel (C/E-Class, Sprinter, Vito). Mercedes OE A6460700987; Delphi equivalent R04201D (HRD342). Replacements are coded to the ECU with the injector trim code. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
Delphi EJBR04201D 2.1/2.2 CDI (OM646) Common Rail Injector (Mercedes-Benz)
Delphi solenoid common-rail injector for the Mercedes-Benz OM646 2.1/2.2 CDI four-cylinder diesel (C/E-Class, Sprinter, Vito). Mercedes OE A6460700987; Delphi equivalent R04201D (HRD342). Replacements are coded to the ECU with the injector trim code. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
A leaking injector unbalances cylinder fuelling on the OM646.
Excess back-leakage drops cranking rail pressure.
Out-of-range delivery or rail-pressure deviation cuts power.
Poor atomisation over-fuels the cylinder.
Cylinder-specific injector or fuel-metering codes.
- InstallationCode the injector trim code to the correct cylinder with Mercedes XENTRY before road test.
- InstallationRenew the combustion seal and hold-down hardware; clean the injector bore.
- MisdiagnosisRead live back-leakage data to find the weak cylinder before removal.
- WarningFix contamination (filter/water/debris) first; the OM646 is sensitive to fuel quality.
- TestingBench-test across delivery and back-leakage points; verify spray pattern before refit.
What is Delphi injector EJBR04201D?+
A Delphi solenoid common-rail diesel injector for the Mercedes-Benz OM646 2.1/2.2 CDI engine. Mercedes OE A6460700987; Delphi equivalent R04201D (HRD342).
Which vehicles use EJBR04201D?+
Mercedes C-Class W203/W204, E-Class W211, Sprinter and Vito/Viano 2.1/2.2 CDI (OM646).
Is it solenoid or piezo?+
It is a Delphi solenoid common-rail injector.
Does EJBR04201D need coding?+
Yes - code the injector trim code to the correct cylinder with Mercedes XENTRY when fitting.
What are the OE part numbers?+
Mercedes A6460700987 references Delphi EJBR04201D (R04201D, HRD342).
Does it fit the OM648 six-cylinder?+
No - EJBR04201D is the OM646 four-cylinder injector. The OM648 uses a different part; confirm the OE number and engine code.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my OM646 run rough?+
A worn or leaking injector unbalances fuelling; read live back-leakage data and bench-test the suspect cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured EJBR04201D perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Delphi plan, then trim-coded on fitment.