If you like, you can skip directly to where you can buy this part.
We sell good, original BMW, used E28 ECU units. The price is $160 plus shipping for the Motronic 1.1 Super Eta 1988 units.
According to one official source catalog, the BMW price for this would be upwards of $1,400 for a unit. Whoa!
A Europe-based vendor is offering new units for 226 Euros. Today, that’s $293.
Some of the mass-market sellers such as eBay or on BMW forums have good prices too … how reliable they are, I don’t know.
It’s probably safe to say that our used units are price-competitive.