ECU Engine Control Module (7612745 / 0261S06348) — BMW 135i / X5 / X6 N55

The ECU serves as the central nervous system of your N55, continuously interpreting data from oxygen sensors, knock sensors, the MAF, and boost pressure sensors to precisely regulate fuel delivery and ignition timing in real time. This unit replicates that functionality with stable power output across a full range of driving and load conditions — critical on a turbocharged platform where a compromised ECU can cause boost spikes, lean conditions, or limp mode. An onboard adaptive learning function also allows the module to refine its calibration over time based on your specific driving habits and conditions.

Fitment is plug-and-play at the hardware level — the connector and mounting points align with the factory ECU location, so no rewiring or bracket fabrication is needed. That said, like any replacement ECU, this unit will likely require programming or coding to your vehicle's VIN before it operates correctly. We strongly recommend having the module flashed or initialized by a BMW-capable diagnostic tool such as ISTA or a qualified independent shop familiar with N55 vehicles.

This unit is a cost-effective alternative to dealer-sourced modules for owners prioritizing restored reliability over performance upgrades. It's best suited for straightforward ECU replacement scenarios — a dead or water-damaged module, a CAN bus fault traced back to the ECM, or a salvage rebuild requiring a matched-spec unit. Verify your VIN, confirm your exact model year fitment before ordering, and you'll have a factory-spec solution at a fraction of the dealership price.