l have a 1998renault megane 1.6e 8 valve covertible. the car broke down a few months ago, renault told me that l needed a new ecu fuse box and key. l found out that l can buy a second hand one which l have done. this seems to make no difference. car stil wont start locks stil dont work and red light on dash stil doest flash. does any body know what l can try?

l had an older one that used to do the same thing. The problem was a printed circuit card which ceased to make a good connection regularly. l had to remove it and clean the contacts about every 6 months. If yours is like that, a Renault mechanic can show you how to take care of the problem.

l am sorry but l am afraid you've wasted your money and your time. Renault ECUs are 'once only use'. When it has been programmed to one car it cannot be re-programmed to any other. A second hand Renault ECU is just useless scrap!

Your only solution is to buy a brand new 'virgin' unit, presumably from Renault themselves, and have it and the key programmed to your car.

you need to go to renault and get it programed