Engine Control Unit (ECU) - 2011 528i S04

When sourcing a replacement DME for your 2011 BMW 528i, verify the donor vehicle carried the N52B30 inline-six (240hp) rather than the later N20 turbocharged four-cylinder introduced mid-generation. The correct Bosch MSD81 unit carries BMW part number 12 14 7 576 005 or supplier casting 0 261 S04 492, interchangeable only with 2011-2012 F10 sedans and F11 Touring wagons. Avoid 2013+ donors entirely as BMW switched engine families. Always inspect the 88-pin connector for green copper oxidation—common from coolant exposure near the bulkhead—and confirm the aluminum heat sink fins aren't damaged. Installation requires professional ISN coding and CAS module synchronization; used ECUs must be virginized to your specific VIN. Check for water intrusion in the E-box compartment before installing replacement hardware, as clogged cowl drain channels destroy replacements within months. Never swap between automatic and manual transmission variants without recoding.