Can any one help? My car ems light came on and my car lost power, took it to renault dealer they put on a new coil pack. A week later same thing happened again, they replaced the coil pack and told me it was because the previous one was faulty.

2 years later the same thing has just happened at my local garage. So i am on my 4th coil pack( the last one fitted a week ago) and my ems light is back on and my car has lost power, my local garage will not re place it again and have said it must be something else.

Any ideas what it could be?