Delphi EJBR04201D Diesel Injector

On the 2.2 / 3.0 CDi platform, a failing Delphi EJBR04201D injector typically presents as: chuffing / ticking noise from the injector area; diesel smell in the engine bay; hard starting and uneven idle; black smoke under load; loss of power with rail-pressure faults.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: injector seat sealing failure allowing combustion gas blow-by and carbon build-up around the injector (widely documented on this engine family); injector back-leak beyond specification; nozzle wear causing over-fuelling.

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

Inspect around each injector for hardened carbon from seal blow-by before diagnosis — clean the seat thoroughly before fitting a replacement. Always fit a new copper sealing washer and follow the manufacturer seating procedure. Run a comparative leak-off test across all injectors before condemning one.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured EJBR04201D is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

The EJBR04201D trusted family covers 5 verified vehicle fitments across 1 make: Mercedes-Benz. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

EJBR04201D supersedes or cross-references 8 further OE numbers, including R04201D, HRD342, A6460700987, 6460700987, A6460700987 80, A646 070 0987, A646 070 0987 80 and 646 070 0987. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.