Saab 900 / 900-S 2.3 Liter non turbo ECU Up for sale is a new old stock Saab 900 ECU. These fit some non-turbo 2.3l 4cyl saab 900 cars. Saab Part number-- 0 261 204 402 / 0261204402 / 47 80 557 / 4780557 . This is OEM to many 900 97 & 98 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, as there are several variants of these you may have!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.