EJBR04201D — Frequently Asked Questions
Verified answers about the Delphi EJBR04201D 2.1/2.2 CDI (OM646) Common Rail Injector (Mercedes-Benz).
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.