28657626 — Technical Research
Delphi common-rail injector for the PSA/Stellantis 2.2 BlueHDi (DW12RU family, engine 4HA/DW12RUE and 4H03/DW12RUD) fitted to the Peugeot Boxer, Citroen Jumper/Relay and Fiat Ducato from 2019. OE 9824388280 (cross 1637131480 / 28492677). Replacement injectors must be coded to the ECU after fitting. Failures are driven by poor fuel filtration, contamination and back-leakage wear. 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 28657626 2.2 BlueHDi (DW12RU / 4HA / 4H03) Common Rail Injector (Peugeot Boxer / Citroen Jumper / Fiat Ducato)
Delphi common-rail injector for the PSA/Stellantis 2.2 BlueHDi (DW12RU family, engine 4HA/DW12RUE and 4H03/DW12RUD) fitted to the Peugeot Boxer, Citroen Jumper/Relay and Fiat Ducato from 2019. OE 9824388280 (cross 1637131480 / 28492677). Replacement injectors must be coded to the ECU after fitting. Failures are driven by poor fuel filtration, contamination and back-leakage wear. 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 2.2 BlueHDi.
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 correction value to the correct cylinder with a PSA/Delphi-capable diagnostic tool before road test.
- InstallationRenew the combustion seal and clamp hardware; torque to spec.
- MisdiagnosisRead live back-leakage data to find the weak cylinder before removal.
- WarningFix contamination (filter/water/debris) first; the 2.2 BlueHDi is sensitive to fuel quality.
- TestingBench-test on a Delphi-capable CR tester across delivery and back-leakage points before refit.
What is Delphi injector 28657626?+
A Delphi common-rail diesel injector for the PSA/Stellantis 2.2 BlueHDi (DW12RU) engine. OE 9824388280.
Which vehicles use 28657626?+
Peugeot Boxer, Citroen Jumper/Relay and Fiat Ducato with the 2.2 BlueHDi engine, from 2019.
Is it solenoid or piezo?+
It is a Delphi solenoid common-rail injector.
Does 28657626 need coding?+
Yes - it must be coded to the vehicle ECU with a PSA/Delphi-capable diagnostic tool after fitting.
What are the OE part numbers?+
PSA 9824388280 references Delphi 28657626 (cross 1637131480 / 28492677).
Which engine codes does it fit?+
The 2.2 BlueHDi DW12RU family - 4HA (DW12RUE, BlueHDi 120) and 4H03 (DW12RUD, BlueHDi 140); confirm by VIN.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my Boxer or Ducato run rough?+
A worn or leaking injector unbalances fuelling; read live back-leakage data and bench-test the weak cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured 28657626 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Delphi plan, then coded on fitment.