Saab 900 ECU Up for sale is a new old stock Saab 900 ECU. Ordered in the mid 2000's as a replacement unit to correct a suspected control unit fault, and the original unit was found to be not the defective component. These fit some non-turbo 2.3l 4cyl saab 900 cars. Saab Part number-- 47 80 540 (4780540) Bosch Part number 0 261 204 401 (0261204401). This is OEM to many 900s 2.3 models but will probably fit some other models too. Check the part number on your original unit to be sure this is correct for your car!I will warranty this to function for 30 days after purchase.This is one of the most common no start or random stalling problems with the Motronic controlled cars. These can also be a problem with erroneous check engine lights / emission control issues. If yours does not have this problem, keep an extra ECU in the trunk, you might some day be glad you did... These units are over $1000 at the Saab dealer, and finding a good one second hand is getting to be a real chore.