Apparently Renault were supplied with a faulty batch of coils
and these have a certain date stamp on them.If these cause problems after the car is out of warranty,then they will be repalced FOC.The numbers effected are posted on the forum somwhere,so if you search for 'Pencil Coils
',you should eventually come across the information.
BUT,from my experience,Renault saying that they have been supplied with one faulty batch is a bit rich!.I have replaced pencil coils
on many different Renaults of varying ages,including my own car.
give problems,full stop,wether they are from a certain batch,have a certain coloured top or anything else doesn't make a blind bit of difference!.
Changing the spark plugs more regularly than suggested adds to coil
life expectancy,as does using genuine plugs.The resistance in the plug is crucial,and even a slightly high resistance in a plug can effect coil
are available aftermarket,so your not stuck with genuine prices.Coils
made by a company called Beru are far more reliable than the Sagem(genuine) ones and are cheaper.I always recommend people change them in sets,as if one gives problems,the others are more or less guaranteed to follow at regular intervals,but I must admit when it comes to my own car,I don't practice what I preach!.I have changed one,and keep a spare one with me,together with a T30 torx screwdriver so I can swap it over if I have problems,no matter where I am!.They always pack up at the worst possible moment!
I hope you find my ramblings interesting....