Hope this helps someone, have a 2004 clio 1.2 16v which apart from a new clutch a few months ago has been faultless for its 82,000 mile life, serviced correctly by independant garage and started to run rough with engine light flashing on and off. Read all the posts about the ECU cover chomping through the loom and checked this, 1 wire bare but not cut, could have been sending to earth so not helpful ( really stupid cover design Renault a monkey could have forseen issues there !). Cleaned 3 relays behind headlight and all this made no difference at all :( . Started thinking Lambda, ECU, Crank Sensor, Loom , you know all those lovely things Renault would charge an arm and a leg for but stopped and went right back to basics, car starts fine with no engine light on, runs like a lumpy pig so going back the days before ECU's and Laptops I would have said H.T lead or maybe coil so checked out a part number with Europarts as the coil pack and leads are one unit and priced at £28.00 thought its worth a go before we get into Diagnostics mumbo jumbo where you pay and don't always get the correct answer ! Fitted coil pack in 10 mins and clio running perfectly so if you have the same issue its well worth a punt for £28.00 before spending loads of cash and a. being ripped off and b. not being told the truth.