BMW Motronic ECU Up for sale is a Working, in excellent condition BMW Motronic ECU. Bosch Part number-- 0 261 200 021 . This unit is from a 86 325e, this ECU should also work with many 325e and 528e cars from 9/84-9/87 and possibly more. Unit is known good (runtested), and is fully functional. This comes with a 30 day functionality guarantee. In the unlikely event that it fails to function properly in the 30 days after you receive it, you can return it to us and we will send you a free replacement.Check the part number on your original (it's above your glove box) This is one of the most common no start or random stalling problems with these Motronic ECU's. 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.