BMW E38 / E39 ECU Up for sale is a Working, in excellent condition BMW E38 V12 ECU. Bosch Part numbers listed at top. This unit should fit 750iL E38 M73/B54 9/94--> 0 261 203 473 Bosch Motronic M5.2 (OBD-II) and is in good working order. Note, these V12 has 1 pair of these ECU's, though they are identical. If either one is defective your car will either not run, or will only run on 6 cylinders. This may also work with other models/years but as usual check your part number to be sure it will work. This is one of the most common no start or random stalling problems with these Motronic ECU's. It is also common for these to cause a no-spark condition. If yours does not have this problem, keep an extra ECU in the trunk, you might some day be glad you did... These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and finding a good one second hand is getting to be a very hard chore.