Its been a nightmare, had the belts done and the warning light came on the same day, the garage kept fobbing me off that it was the cat getting used to the proper fuelling again. Problem was persistant and found that it would come on either when starting the engine or after few minutes of running, when it did the car struggled to have any power an unable to accelarate
second garage finally confirmed broken wires so they spent ages going through all the engine loom finding the broke ones. Maybe worth considering as clio's dont seem to have the best of wiring lol