Diagnóstico / Códigos de avería
Injector circuit malfunction — cylinder 3
P0203 is a fuel system fault on the Mercedes Sprinter VS30 (OM642 3.0L V6 diesel). Mercedes describes it as: "Injector circuit malfunction — cylinder 3".
Qué significa este código
P0203 on the Mercedes Sprinter VS30 falls under the fuel system fault group for the OM642 V6 diesel. The official Mercedes-Benz description is "Injector circuit malfunction — cylinder 3". The ECU sets this code when it detects an out-of-range condition in this system. Use the symptoms, common causes, and diagnostic steps below as a starting point, and always read the live data and freeze-frame for this specific code before replacing parts. If you're searching for the P0203 Mercedes Sprinter fix or P0203 VS30 / OM642 information, start with a full scan to capture any related codes stored at the same time.
Descripción oficial
- Injector circuit malfunction — cylinder 3
Síntomas
- Reduced engine power or hesitation
- Hard starting or extended cranking
- Possible limp mode
- Check engine light
- Rough idle
Advertencia — revísalo pronto
P0203 is a fuel system fault on the Mercedes Sprinter VS30 (OM642 3.0L V6 diesel). Mercedes describes it as: "Injector circuit malfunction — cylinder 3".
Causas posibles
- Fuel injector wear or leakage
- Fuel rail pressure regulation fault
- Clogged fuel filter or restricted supply
- High-pressure pump wear
- Sensor or wiring fault in the fuel system
Pasos de diagnóstico
- Scan and record all codes, noting any related fuel codes stored together.
- Review freeze-frame data for rail pressure, fuel temperature, RPM, and load.
- Inspect fuel lines, the filter, and connections for leaks or restriction.
- Monitor live rail/supply pressure (actual vs. commanded) at idle and under load.
- Test the suspect sensor, valve, or injector against Mercedes spec.
- Repair or replace the failed component, then clear codes and verify the fix on a road test.
Reparaciones recomendadas
- Replace a clogged fuel filter and confirm a clean, unrestricted supply.
- Replace a worn or leaking injector (and re-code it if required).
- Repair fuel leaks or restrictions in the supply and return lines.
- Replace a faulty rail-pressure sensor or pressure-regulating valve.
- Replace a worn high-pressure pump when delivery is out of spec.