Up for sale is a Working, in excellent condition Peugeot 405 ECU. Bosch Part number-- 0 261 200 177 . This unit is from a 405, 1989 model year, 

Check the part number off your original before buying. These can very commonly cause multiple strange problems with these cars, including non running. These are very hard to find now in good working condition, new is over $1000, rebuilt $500+. This comes with a 30 day functionality guarantee.