ECU Mercedes A2721533291 / Bosch 0261209220 – VIRGIN engine control unit, ready for programming
We offer an original Mercedes engine ECU with part numbers A2721533291 and Bosch 0261209220, prepared in VIRGIN state. This means the module has been professionally cleared of all data from the previous vehicle and is ready for first-time initialization exactly like a brand-new unit from the dealership. The ECU is suitable for full adaptation in the vehicle – it only requires standard programming.
The A2721533291 model belongs to the ECU family used in M272 engines, the well-known Mercedes-Benz V6 petrol powerplants. This ECU is used in models such as:
- Mercedes C-Class W203 / W204 – 2.5 V6, 3.0 V6
- Mercedes E-Class W211 / W212 – 2.5 V6, 3.0 V6
- Mercedes CLS W219 – 3.0 V6
- Mercedes SLK R171 – 2.5 V6, 3.0 V6
- Mercedes ML W164 – 3.5 V6
- Mercedes GL X164 – 3.5 V6
- Mercedes R-Class W251 – 3.5 V6
Depending on the model version, the 0261209220 ECU was installed in vehicles roughly from 2004–2011. Therefore, comparing the part numbers before purchase is always recommended.
Why is the VIRGIN version the best choice?
A VIRGIN ECU contains no immobilizer data, configuration or vehicle history. There is no need to clone the damaged ECU, which is often difficult or impossible if the memory is corrupted. The new ECU automatically takes all necessary data from the vehicle during the first coding procedure.
To program the A2721533291 / 0261209220 ECU, the following tools are recommended:
- Star Diagnosis / Xentry (official Mercedes-Benz tool)
- ECU programmers compatible with Bosch ME control units
- professional diagnostic testers that support Mercedes ECU adaptation
Each module offered for sale is tested for communication, memory integrity and control section reliability. You receive a clean, verified and 100% ready-to-program ECU.
Q: Will the A2721533291 / 0261209220 ECU work in any Mercedes with an M272 engine?
A: Yes, provided the part number is identical. The M272 family includes several ECU versions, so always check the label or send us a photo for confirmation.
Q: What does VIRGIN mean?
A: It means the ECU has been wiped of all previous immobilizer and configuration data. It behaves like a brand-new unit and accepts the vehicle’s data during first coding.
Q: Does the A2721533291 ECU need programming?
A: Yes, programming and adaptation with Star Diagnosis or a compatible tool is required.
Q: Can I install the ECU myself?
A: Physical installation is easy, but programming must be performed by someone with proper diagnostic equipment.
Q: Is the 0261209220 ECU refurbished?
A: No – the module is not repaired. It is factory-reset, clean and tested, with no signs of electronic tampering.
Q: Can I return the ECU if it does not fit?
A: Yes – returns are accepted according to regulations. To avoid mismatches, send us a photo of your ECU label beforehand.
