Hello, I don't know where to start, someone who de...

Hello, I don't know where to start, someone who deals with electronic matters saw my Renault car which couldn't find the problem with my car which was in the garage for almost a month. I think the personnel who take care of the electronic system and who work in the garage need to review their work because they are incompetent. I pass my car on to a friend who has an average garage who found the breakdown for me in 30 minutes.