Peugeot 505 ECU Up for sale is a Working, in excellent condition Peugeot 505 ECU. Part number-- 0280800056. This unit is from a Peugeot 505, and fill fit the following - PEUGEOT505(1982 - 1985)PEUGEOT505 GL(1984 - 1985)PEUGEOT505 S(1984 - 1985)PEUGEOT505 STI(1984 - 1985)best bet is to match the part number with the part you need. This is one of the most common no start or random stalling problems with these Jetronic 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.