Here is the detailed information regarding the Bosch 0445120212 injector as used in the Volkswagen Worker (predominantly the Latin American market truck based on the MAN/Volkswagen partnership, or the Delivery/Constellation series) equipped with Cummins engines.
1. Confirmation of Details
Part Number: Bosch 0445120212 (This is the OEM Bosch number; VW or MAN may have a different branded number, such as 51.12501.7039 or 2 447 112 158).
Application: Volkswagen Worker (models including the Worker 8.150, 9.150, 13.180, etc.).
Engine: Cummins ISF 3.9L (4 cylinder) and ISF 5.9L (6 cylinder), specifically the Cummins ISBe and ISDe families used in these chassis.
Year Range: 2003 – 2011.
2. Technical Specifications
This is a Bosch CRI (Common Rail Injector) . It is a high-precision component.
Type: CRI2 (Common Rail Injector 2nd generation)
Nozzle Type: Sacrifice volume (VCO)
Hole Configuration: Typically 7 holes (varies slightly by exact calibration)
Flow Rate: Approximately 720 cc/min (depending on the specific calibration code)
Energizing Time: Standard Bosch CRI2 specifications
The "IQ Code" (Coding)
This injector uses a C2I (Injector Classification Code) .
When installing new or remanufactured injectors, you must input the 6 or 7-digit alphanumeric code (printed on the injector body) into the engine ECU using diagnostic software (like Cummins Insite, Bosch ESI[tronic], or a high-level scanner).
Failure to code the injectors will result in rough idle, white smoke, poor fuel economy, and potential DPF issues (if equipped).
High-Pressure Pump Compatibility
The Volkswagen Worker with the 3.9/5.9 Cummins uses a Bosch CP3 pump. If you are replacing injectors due to metal contamination (shiny diesel fuel), you must:
Flush the fuel rails.
Replace the high-pressure pump.
Replace all injectors.
If you only replace the injectors without addressing contamination from a failing CP3 pump, the new injectors will fail within hours of startup.
