Up for sale is a Saab 900 / 900-S ECU, original equipment for 1991 900 2.1 Liter non turbo cars, manual or automatic.  Also works with 92 & 93 non turbo 2.1 liter 900 models, manual or automatic.  This is the only fitment for this unit!  This is a pretty rare ECU, ECU. Part number--

0280000901

/ Saab part number 8788507 .  Please check the part number off of your original before buying to be sure. - if you have a 92 or 93 900 non turbo, the part number won't match your original, but this unit will still work.   A Faulty ECU is one of the most common no start or random stalling problems with the cars (among others). 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 $$, and finding a good one second hand is getting to be a chore. Thanks for looking!